1 alter, damage, fiddle (informal) fool about (informal) interfere, intrude, meddle, mess about, monkey around, muck about (Brit. slang) poke one's nose into (informal) tinker
2 bribe, corrupt, fix (informal) get at, influence, manipulate, rig
English Collins Dictionary - English synonyms & Thesaurus
tamper ( tampers 3rd person present) ( tampering present participle) ( tampered past tense & past participle ) If someone tamperswith something, they interfere with it or try to change it when they have no right to do so. verb
I don't want to be accused of tampering with the evidence... V with n
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