act (up)on

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act (up)on

1. To take action in a situation. The report is due tomorrow, so I need you to act on it immediately. Please act upon this subpoena for records at once.
2. To take action that is strongly influenced by certain information or advice. ("Upon" is most commonly used to convey this meaning.) Acting upon my doctor's orders, I cleared my schedule and spent the week recuperating at home. A; "I can't believe he said that about us!" B: "Well, he's probably just acting on his mother's instruction, and that woman hates us."
3. To impact in some way. The barking dogs next door are acting on my patience.
See also: act

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.
See also: act, on

act on

1. Also, act upon. Conduct oneself in accordance with or as a result of information or another action, as in I will act on my lawyer's advice, or The manager refused to act upon the hotel guest's complaints. [c. 1800]
2. Influence or affect, as in The baby's fussing acted on the sitter's nerves. [c. 1800]
See also: act, on
References in periodicals archive ?
There are four forces that act upon the hammer and must be maximized in the acceleration or work phase: (1) gravity, (2) torsional "pushing" of the hip/shoulder separating, causing tangential acceleration, (3) linear "dragging" (along the wire), causing tangential acceleration of the hammer toward the hands, and (4) centripetal force along the wire, causing tangential acceleration of the hammer.
Counts two through five - lewd act upon a child under the age of 14, between February 20 and March 12, 2003.
Ms Rehman called upon the Muslim Ummah to strictly act upon the teachings of Islam and the Seerat un nabi (PBUH) if they wanted to get rid of their problems which the Muslim Ummah was confronting at presently.