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tamper (v.)

"meddle, interfere," 1560s, figurative use of tamper "to work in clay, etc., so as to mix it thoroughly," probably originally a variant of temper (v.), which is how it often was spelled at first. Perhaps it is a dialectal workmen's pronunciation. Related: Tampered; tampering.

tamper (n.)

"one who or that which tamps," 1864, agent noun from tamp (v.).

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