(intransitive) to fool around

present participle of fool about

(idiomatic) A foolish undertaking, especially one that is purposeless, fruitless, nonsensical, or certain to fail. / (idiomatic) Such an undertaking, assigned as a prank.

(idiomatic) To behave in a foolish or comical manner. / (idiomatic) To pretend/feign ignorance.

(intransitive) to play the fool

Having the heart of a fool; foolish.

Third-person singular simple present indicative form of play the fool

Aethusa cynapium, an annual umbelliferous plant that resembles parsley but is poisonous.

(chess) The quickest possible checkmate in the game of chess.

Foolishly; in a foolhardy manner.