ACT (UP)ON SOMETHING

act (up)on something: translation

act (up)on something

1. to take action on a particular problem. (

Upon

is more formal and less commonly used than

on

.) •

I will act on this immediately.

2. to take action because of some special information. •

The police refused to act upon his complaint because he was an ex-convict.

3. to perform on something, usually the stage (in a theater). •

Ken has never acted on the stage or in front of a camera.