fool around with
phrasal-verb
UK: /fuːl əˈraʊnd wɪð/
US: /fuːl əˈraʊnd wɪθ/
To spend time playing or doing things that are not useful or serious with something.
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Don't fool around with the cooker, you might break it.
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The children should not fool around with dangerous chemicals in the laboratory, even under supervision.
To treat someone or something without the respect or seriousness that they deserve.
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I don't like people who fool around with my feelings.
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The government must not fool around with environmental regulations if we hope to preserve our planet.
To have a sexual relationship with someone, especially when you should not.
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He's been accused of fooling around with a coworker.
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She found out her husband had been fooling around with someone he met at the gym, which caused a lot of problems.