fool around with

idiom

Definition of fool around with

1 : to use or do (something) in a way that is not very serious I'm not really a painter; I just like to fool around with paints.
2 : to handle or play with (something) in a careless or foolish way Don't fool around with that gun.
3 : to have sex with (someone who is not one's husband, wife, or regular partner) His wife discovered that he was fooling around with his secretary.

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