Definition of act on/upon
- They never acted on the information they had.
- It's okay to feel angry or jealous, but you mustn't act on those feelings.
: the doing of a thing : deed
: something done voluntarily
: the process of doing something : action
: to take action : move
: to conduct oneself : behave
: to perform on the stage
used for a standardized achievement test to evaluate suitability for college admission
: on the surface : on it
: thereafter, thereon
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