underlie

underlie — verb

1. to serve as the deep reason or foundation that something else depends on, especi

1.動詞及物C1
釋義

to serve as the deep reason or foundation that something else depends on, especially when this connection is not directly obvious or visible.

例句

Several psychological factors underlie Mayumi's decision to change careers.

abstract noun + underlies + decision/change — hidden cause pattern

The principles that underlie the constitution have guided the country for more than two centuries.

principles that underlie — relative clause pattern

同義詞
  • form the basis of

    more explicit about foundational support; common in formal writing

  • be at the root of

    more informal and metaphorical; suggests origin rather than ongoing support

  • ground

    stronger, implies something is built on a solid foundation; 'His theory is grounded in years of data.'

反義詞
  • overlie

    literal opposite; used in geology and spatial contexts

  • undermine

    weaken or destroy the foundation of, rather than supporting it

文法句型

[abstract noun / principle / factor + underlies + [the thing it explains]

[noun] underlying [noun] — attributive adjective form

用法筆記

Commonly used in academic, analytical, and formal writing. The subject is almost always an abstract noun (principle, cause, factor, assumption, belief) — never a person. Frequently rephrased as the attributive adjective 'underlying' (e.g., 'the underlying cause').

常見錯誤

❌The manager underlies the team's success.
✅The manager's leadership underlies the team's success.
💡The subject must be a factor or reason, not a person.
❌His hard work is underlying his success.
✅His hard work underlies his success.
💡Underlie is not used in progressive tenses.

2. to be positioned directly under something else, typically as a support, a hidden

2.動詞及物C1
釋義

to be positioned directly under something else, typically as a support, a hidden layer, or a foundation that something rests on.

例句

A thick layer of clay underlies the topsoil in this part of the garden.

geological layer + underlies + surface layer

Ancient Roman foundations underlie many buildings in the historic district of the city.

archaeological context: foundations underlie buildings

同義詞
反義詞
  • overlie

    the direct opposite; used in geology to describe what sits on top

文法句型

[physical object / layer + underlies + [what is above]

underlie + noun phrase — direct statement of position

用法筆記

This literal sense is much less common than the abstract sense (sense 1) and is mostly found in technical descriptions — geology, archaeology, architecture, and geography. In everyday speech, 'lie under' or 'is underneath' is preferred.

常見錯誤

❌The cat underlies the table.
✅The cat is lying under the table.
💡For everyday positioning of animals or objects, use 'lie under' or 'is underneath', not 'underlie'.
❌The carpet underlies the floor.
✅The carpet lies under the table.' or 'A layer of felt underlies the carpet.
💡Underlie implies a structural or supporting position, not casual placement.