fool around

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fool around (third-person singular simple present fools around, present participle fooling around, simple past and past participle fooled around)

1. (intransitive, idiomatic) To engage in frivolous behaviour; to monkey around.
2. (intransitive) To waste time.
3. (intransitive, informal, idiomatic) To engage in casual or flirtatious sexual acts.

   Jake has been fooling around with a married woman.

4. (intransitive, informal) To engage in adultery; to play around.