op

1.名詞B2

釋義

an operation on a person's body, mentioned in a short everyday way rather than with the full medical word.

例句

Marcus is in hospital for a knee op tomorrow morning.

have an op; body-part + op

The surgeon said the heart op could take four hours.

medical collocation: heart op

同義詞

operation
the full standard word; less informal than 'op'
surgery
can mean the medical process in general, not only one specific event
procedure
broader hospital term that may include treatments that are not major surgery

文法句型

have an op

need an op

after the op

用法筆記

Most common in speech and informal writing such as messages or newspaper headlines. Doctors speaking to patients may use the full word 'operation' instead when they want to sound clearer or more formal.

常見錯誤

❌My mother did an op yesterday.

✅My mother had an op yesterday.

💡patients usually have an op; surgeons perform one.

❌The op room is upstairs.

✅The operating room is upstairs.

💡this clipped form is natural for the event, not for hospital department names.

2.名詞B1

釋義

in an online discussion, the person who wrote the first post and started the thread.

例句

Several users thanked the OP for sharing the bus timetable.

thank the OP for + noun/-ing

The OP later added photos of the broken bridge.

the OP + later added ...

同義詞

original poster
the full form behind the abbreviation
thread starter
plain descriptive alternative on forums
poster
broader word that can mean any person who writes in a thread

文法句型

the OP said

ask the OP

the OP + verb

用法筆記

Used mainly on forums, Reddit-style threads, and comment sections. It usually appears with the article 'the', because readers are pointing to one specific person inside that discussion.

常見錯誤

❌The OP means old post here.

✅The OP means the original poster here.

💡on forums, OP usually points to a person, not a message.

❌OP said me to wait.

✅The OP told me to wait.

💡use normal reporting verbs after this internet term.

3.名詞C1

釋義

a chance to do something useful, exciting, or helpful, expressed with a short clipped form of 'opportunity'.

例句

Internship week gave Mei an op to work with real designers.

an op to + verb

The Seoul trade fair is a great op for our team to meet clients.

a great op for + noun + to-infinitive

同義詞

opportunity
the full standard word; safer in formal writing
chance
more general and much more common in everyday English
opening
often suggests a useful moment that may disappear soon

反義詞

obstacle
something that prevents action instead of making it possible

文法句型

an op to + verb

a great op for + noun

miss an op

用法筆記

Commonest in speech, business chat, and quick notes. Distinguish from abbreviation sense 3: this noun sense behaves like a normal countable word inside the sentence, while abbreviation sense 3 is mainly a written shorthand label.

常見錯誤

❌I had an op of meeting the editor.

✅I had an op to meet the editor.

💡this clipped form follows the same pattern as 'opportunity': 'an op to do something'.

❌The city is a big op.

✅The city offers a big op for new shops.

💡the word names a chance, not the place itself.

4.名詞C1

釋義

the label 'Op.' placed before a number to show where a piece belongs in a composer's numbered list of works.

例句

On the concert poster, Beethoven's sonata appears as Op. 27 No. 2.

Op. + number + No. + number

The score labels the quartet as Op. 18 No. 4.

score labels ... as Op. + number

同義詞

opus
the full Latin-based term that 'Op.' shortens
work number
an explanatory phrase, not the standard printed label

文法句型

Op. + number

Op. + number + No. + number

用法筆記

Seen mostly in printed titles, concert programmes, catalogues, and music study. Distinguish from abbreviation sense 4: this noun-like use is the actual numbering label attached to a work, while abbreviation sense 4 names the shortened written form itself.

常見錯誤

❌Opus 27 No. 2' and 'Op. 27 No. 2' are always interchangeable in any title line.

✅Use the form printed in the score or programme.

💡publishers may choose one style and keep it consistently.

❌The song has op 12.

✅The piece is marked Op. 12.

💡write the abbreviation with a capital O and a period in formal music references.

1.縮寫C1

釋義

a short written form used in labels or notes for words such as 'operation', 'operative', or 'operator', with the exact meaning decided by the context.

例句

The TV schedule lists Ben as the camera op tonight.

job label: camera op = camera operator

The factory roster marks Ava as a press op on Line 3.

staff roster shorthand: press op

同義詞

operator
one common expansion, especially in job labels
operative
another expansion, often in security or military writing
operation
another expansion, common in technical notes or workflow charts

文法句型

camera op

machine op

op = operation / operative / operator

用法筆記

Meaning changes from document to document, so learners should expand it from nearby words rather than memorising one single gloss. Distinguish from noun sense 1: this abbreviation sense is mainly a written label, while noun sense 1 is the spoken clipped word for surgery.

常見錯誤

❌An op arrived at the studio' when you mean a worker.

✅A camera op arrived at the studio.

💡this shorthand usually needs a clear context word before it.

❌Op always means operator.

✅Op may mean operation, operative, or operator.

💡check the document's field or heading.

2.縮寫B2

釋義

a short written mark meaning that a book or other printed title is no longer being produced by the publisher.

例句

The online catalogue marks the 1984 guidebook as op.

marked op in a catalogue entry

Several early poems from Kim's first book remain op and hard to find.

be op + hard to find

同義詞

out of print
the full standard phrase
unavailable
broader and weaker; does not always mean printing has ended

反義詞

in print
still being produced by the publisher

文法句型

be op

go op

marked op

用法筆記

Mostly appears in catalogues, stock lists, and book-trade writing. Distinguish from 'unavailable': an unavailable book may return soon, but an op title is no longer being printed at all.

常見錯誤

❌The shop is op today.

✅The shop is closed today.

💡this abbreviation is for printed titles, not for businesses.

❌The book is op because the shelf is empty.

✅The book is out of stock because the shelf is empty.

💡empty stock today does not always mean the title is permanently out of print.

3.縮寫C1

釋義

a quick written shortening of 'opportunity', especially in notes, slides, or business messages where space is tight.

例句

Her notebook marks each possible sale as a new op.

note-taking shorthand: op = opportunity

The sales slide calls Kaohsiung a strong growth op for tea brands.

business shorthand: growth op

同義詞

opportunity
the full standard form
chance
a simpler everyday word, but not a written abbreviation

文法句型

op = opportunity

growth op

sales op

用法筆記

Mostly seen in private shorthand, sales talk, or startup chat, not in careful public writing. Distinguish from noun sense 3: this abbreviation sense often appears as a brief written tag in lists and slides, while noun sense 3 behaves as an ordinary spoken word inside a full sentence.

常見錯誤

❌The report says many op in Asia.

✅The report says there are many opportunities in Asia.

💡expand the word in formal writing for clarity.

❌One op are left.

✅One op is left.

💡even in shorthand, singular 'op' takes a singular verb.

4.縮寫C1

釋義

the shortened written form of the word 'opus' in catalogues, score titles, and other music references.

例句

The library card file expands op. to opus in full citations.

op. = opus in catalogues

In music class, students learn that Op. and opus mark the same system.

Op. and opus as equivalent forms

同義詞

opus
the full form that the abbreviation represents

文法句型

op. = opus

Op. + number

用法筆記

Usually appears exactly as printed in titles, catalogues, and notes about classical music works. Distinguish from noun sense 4: this abbreviation sense names the shortened form itself, while noun sense 4 uses the label as part of a work number.

常見錯誤

❌op' and 'Op.' should be written the same way everywhere.

✅Use Op. with a capital letter and period in formal music references.

💡printed music normally follows a fixed style.

❌The title says opus. 12.

✅The title says Op. 12.

💡do not mix the full word and the abbreviation in one label.

5.縮寫C1

釋義

short for 'observation post', a place where soldiers watch an area and report what they see.

例句

The map marks an old enemy op on the hill above the river.

map label: enemy op

Soldiers reported smoke near the forward op at dawn.

forward op in military report style

同義詞

observation post
the full standard form
lookout
broader word for a watching position

文法句型

enemy op

forward op

return to the op

用法筆記

Seen mainly in maps, military reports, and war histories. The abbreviation refers to the lookout place itself, not to the people standing there.

常見錯誤

❌The op walked back to camp.

✅The patrol walked back to camp from the op.

💡the abbreviation names a place, not a person.

❌The office is our op.

✅The hilltop is our op.

💡use it for a watching position in the field.

op

op — noun

1. an operation on a person's body, mentioned in a short everyday way rather than w

文法句型

用法筆記

常見錯誤

2. in an online discussion, the person who wrote the first post and started the thr

文法句型

用法筆記

常見錯誤

3. a chance to do something useful, exciting, or helpful, expressed with a short cl

文法句型

用法筆記

常見錯誤

4. the label 'Op.' placed before a number to show where a piece belongs in a compos

文法句型

用法筆記

常見錯誤

op — abbreviation

1. a short written form used in labels or notes for words such as 'operation', 'ope

文法句型

用法筆記

常見錯誤

2. a short written mark meaning that a book or other printed title is no longer bei

文法句型

用法筆記

常見錯誤

3. a quick written shortening of 'opportunity', especially in notes, slides, or bus

文法句型

用法筆記

常見錯誤

4. the shortened written form of the word 'opus' in catalogues, score titles, and o

文法句型

用法筆記

常見錯誤

5. short for 'observation post', a place where soldiers watch an area and report wh

文法句型

用法筆記

常見錯誤