injection
injection — noun
1. a medical procedure in which a liquid medicine or drug is pushed through a hollo
a medical procedure in which a liquid medicine or drug is pushed through a hollow needle into a person's skin, muscle, or vein so that it enters the bloodstream or body tissue.
The nurse gave Asher an injection in his upper arm before the flight.
collocation: give + an injection + in/into [body part]
Mayumi needed a daily insulin injection to keep her blood sugar stable.
injection + of [drug] for chronic condition
Free flu injections are offered at the clinic every autumn for elderly residents.
The doctor used a thin needle so the injection would hurt less.
Some medications work faster as an injection than as a pill.
- shot
informal, very common in American English (e.g., 'a flu shot')
- jab
informal, common in British English (e.g., 'a covid jab')
- vaccination
narrower meaning — specifically for injections that prevent disease, not for medication in general
- inoculation
formal and somewhat dated; refers to introducing a weak form of a disease to build immunity
文法句型
give/get/receive an injection
injection + of + [medicine/vaccine/insulin]
injection + in/into + [body part]
用法筆記
Commonly used with the verbs 'give', 'get', 'have', or 'receive'. The specific location of the injection is usually introduced by 'in' or 'into' (e.g., 'an injection in the thigh').
常見錯誤
2. a large amount of money, investment, or new resources that is put into a company
a large amount of money, investment, or new resources that is put into a company, project, or national economy to strengthen it, help it recover from trouble, or make it grow.
The struggling car manufacturer needed an injection of cash to avoid bankruptcy.
collocation: injection of cash
Saira's startup stayed afloat thanks to a capital injection from a group of overseas investors.
collocation: capital injection
A fresh injection of government funds helped rebuild the damaged railway line.
Without the injection of new technology, the old factory could not compete with modern rivals.
The central bank announced a major injection of money into the banking system.
- infusion
very similar meaning, often used for the introduction of money or new ideas into an organisation (e.g., 'a capital infusion')
- investment
broader; an injection of money specifically implies an urgent or large-scale investment aimed at rescuing or reviving something
- stimulus
usually refers to government spending aimed at the whole economy rather than a single company
- withdrawal
the removal of money or resources
- cut
a reduction in spending or funding
文法句型
a(n) [adjective] injection of [money/capital/funds]
injection + into + [company/economy/project]
用法筆記
Commonly followed by 'of' plus the resource being introduced (money, capital, funds, cash, technology). The target recipient is introduced by 'into'. Typically used in business journalism and economic reporting.
常見錯誤
3. a mechanical process in which a liquid, gas, or fuel is forced under high pressu
a mechanical process in which a liquid, gas, or fuel is forced under high pressure into an engine, chamber, or other system so that it mixes with air or reacts to produce power or a desired effect.
Modern cars rely on electronic fuel injection to burn petrol more efficiently.
compound noun: fuel injection
Hiro replaced the faulty injection pump on his diesel truck over the weekend.
compound: injection pump
The mechanic found a blockage in the fuel injection nozzle of the delivery van.
Fuel injection systems spray a fine mist of petrol directly into the engine cylinders.
The factory uses steam injection to speed up the chemical reaction in the pipes.
- fuel delivery
broader term for the process of moving fuel to the engine, not necessarily under pressure
- spraying
describes the physical action but is less precise and not a standard technical synonym
文法句型
fuel injection
injection + pump/valve/nozzle/system
用法筆記
Most commonly encountered in the compound 'fuel injection'. Can be used with other substances (steam, water, air) in industrial or engineering contexts. Frequently modifies other nouns (injection pump, injection valve, injection nozzle).