act the fool

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act the fool

1. To behave comically or playfully, often to amuse others. If you continue to act the fool, you're going to have to leave the classroom. Joe never acts the fool—he's always serious.
2. To behave irresponsibly or immaturely, especially in an environment where it is especially inappropriate. Don't let me catch any of you kids acting the fool at the museum—it's a privilege to even go inside. We finally get invited to a nice dinner party and you have to go and act the fool—what's wrong with you?
See also: act, fool