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English definition of “mess with sth”

mess with sth

mainly US
verb uk phrasal verb with mess   /mes/ us  
to try to change or repair something, but not carefully and usually without success: He was messing with his bike and then he couldn't fit the parts back together.
(Definition of mess with sth from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
What is the pronunciation of mess with sth?
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