noun
a person who behaves in a silly or foolish way
verb
to behave in a silly or foolish manner
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It is unprofessional to act/play the fool during a business meeting.
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Stop acting/playing the fool and focus on the task at hand.
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Why do you always have to act/play the fool in front of everyone?
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Sometimes, it's necessary to act/play the fool in order to lighten the mood.