Tamper

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Tamper

(n.) One who tamps; specifically, one who prepares for blasting, by filling the hole in which the charge is placed.
(n.) An instrument used in tamping; a tamping iron.
(v. i.) To meddle; to be busy; to try little experiments; as, to tamper with a disease.
(v. i.) To meddle so as to alter, injure, or vitiate a thing.
(v. i.) To deal unfairly; to practice secretly; to use bribery.