(intransitive, idiomatic) To misbehave; to cause trouble. / (intransitive, idiomatic) To perform the duties of an appointment senior to that actually held; to deputise for a superior.

To take action on the basis of information received or deduced.

(intransitive) to play the fool

Used other than figuratively or idiomatically: see act, out. / (idiomatic) To perform a scene from a play, a charade or an exercise. / (idiomatic) To perform a fantasy in reality.

Any act involving sexual stimulation; a sex act.

Any act involving sexual stimulation.

(slang) Suicide.

A law which has received assent (royal, presidential or gubernatorial) after having been passed by the houses (or house) of a parliament.

An excellent performance. / Someone or something whose performance is excellent. / (sometimes sarcastically) Someone or something who is generally well-mannered, conscientious, etc.

(law) An unforeseen occurrence beyond one's control, such as a natural disaster. / Used other than figuratively or idiomatically: see act, of, God.