noun
a person who tampers with something
verb
to interfere with something in order to cause damage or make unauthorized alterations
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It is a serious offense to tamper with evidence in a criminal investigation.
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I wouldn't tamper with that machine if I were you, it's very delicate.
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Don't even think about tampering with my phone, I'll know if you do.
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She refused to let anyone tamper with her emotions after the breakup.