Definition of trifle with phrasal verb from the Oxford Advanced Learner's Dictionary

 

trifle with

 phrasal verb
phrasal verb
 
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Phrasal Verbs

trifle with somebody

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trifle with something

 
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(formal) (used especially in negative sentences) to treat somebody/something without genuine respect He is not a person to be trifled with. You should not trifle with someone’s affection.
See the Oxford Advanced American Dictionary entry: trifle with