mess around with
US /mes əˈraʊnd wɪθ/
UK /mes əˈraʊnd wɪθ/
1.
to spend time idly or unproductively
:
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He likes to mess around with his computer on weekends.
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Don't mess around with that old engine if you don't know what you're doing.
2.
to have a casual sexual relationship with someone
:
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I heard he's been messing around with someone from work.
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She warned him not to mess around with her feelings.