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

mess with

phrasal verb

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mess with somebody/something

(usually used in negative sentences) to get involved with somebody/something that may be harmful
- I wouldn't mess with him if I were you.
- Don’t mess with fireworks.
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See mess with in the Oxford Advanced American Dictionary

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Phrasal verbs

Idioms

mess with somebody's head

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verb

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