(Australia) The middle of three levels of alert issued by government authorities in response to a bushfire, indicating that the danger is approaching and residents need to take action.

To sneak into a venue during the intermission without paying.

(intransitive) To perform on stage; to act in a play. / (transitive) To play (a scene, role etc.); to act out.

(psychology) A behavioral approach to psychological study with a focus on studying and inferring from actions rather than by studying through reflection or introspection.

To behave in a manner appropriate to one's age. / (imperative, originally US) To behave in a mature manner; to avoid being childish.

A performance that is so outstanding that it is unlikely to be equalled.

plural of Act of Parliament clock

(law) A doctrine in the law of wills under which a testator may effectively change the disposition of his property without changing the text of the will, so long as the acts or events changing the disposition have some significance other than avoiding the requirements of the will.

Synonym of hard act to follow

(UK, historical) A large clock, once hung in inns, erroneously thought to derive from a tax on clocks.