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to act as

to act as

199 2.6
Serve in the role of a person or thing
  • phrasal verb
  • /ækt æz/
translation icon : actuar como
  • I told Danceny you would act as his confidant and adviser.
  • act as a mediator
  • act as a liaison
  • act as a consultant

We need to think and act as one species.

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Examples

  • In this test, each team must act as a single unit to avoid obstacles, retrieve the sweet rock and return to the nest.

  • And yet we are acting as if it's business as usual.

  • We need to think and act as one species.

  • I asked the target to act as bait on the road.

  • I promise you, we will act as gently as the situation allows.

  • The hospital administrators could likely act as change agents within their respective organizations.

    Academic text (2015)
  • As music educators, we must act as advocates for ourselves and our content area.

    Academic text (2015)
  • The university supervisor was expected to act as a resource, mentor, and evaluator.

    Academic text (2011)
  • Booms float on the surface and act as barriers to prevent oil from spreading.

    Academic text (2012)
  • The children must act as leaders during the group project to guide their classmates.

Synonyms

to serve
vsto act as
1.7

To work for someone or act in an official role, often in the military

focuses on acting in a role or capacity rather than general employment
to perform
vsto act as
1.3

To do a task or duty

emphasizes behaving in a specific role rather than just doing tasks
to function
vsto act as
441 2.6

To work in a particular role or job

is about behaving or filling a role rather than only working
to act
vsto act as
279 1.0

Have an effect or work in a certain way

covers serving or behaving in a role generally, not only temporary effects
to be
vsto act as
225 1.0

Act as a character in a play or film

relates to actual role or capacity in real situations, not only acting
to exercise
vsto act as
98 3.3

Carry out the duties of a job or role

is about occupying or behaving in the role rather than task execution
to play the role of
vsto act as
36 3.0

To act as a character in a play or as someone in a real situation

applies more broadly to real role or capacity beyond staged parts
to sit in for
vsto act as
24 4.2

To take someone's place for a short time and do their job

is broader, covering normal role or capacity not only temporary replacement
to take on the role
vsto act as
10 3.1

Accept a job, responsibility, or part in a play

is about serving or behaving in that position rather than only starting it
acting
vsto act as
3 3.7

Temporarily doing the job of the usual person

is the general idea of serving or functioning in a role, not only temporary fill

How Well

to perform
1.3
to function
441 2.6
to act as
199 2.6
to stand in
115 3.5

Surface Forms

act as infinitive
acted as past
acted as past participle
acting as present participle
acts as third person singular

Morphology

act + as

The meaning (to behave in a role or pretend to be something) is directly built from 'act' (to behave) plus 'as' (in the capacity/role of), so the overall sense is compositionally predictable. This role-marking use of 'as' is common in English and parallels patterns in many languages, so a B1 learner who knows the constituents should be able to infer the MWE meaning.

Etymology

Act as comes from the idea of an actor on stage who plays a role. When something 'acts as' a tool or leader it takes that job, so the phrase means 'to serve' or 'to function'.