tamper

To experiment rashly; busy one’s self unwisely or officiously; meddle: usually followed by with in this and the other senses.

To interfere, as for the purpose of alteration; make objectionable or unauthorized changes (in): as, to tamper with a will or other document.

To use secret or underhand measures; exert unfair or corrupt influence; especially, to use improper persuasions, solicitations, bribery, etc.

One who tamps, or prepares for blasting by stopping the hole in which the charge is placed.

An instrument used in tamping; a tamping-bar or tamping-iron.

One who tamps; specifically, one who prepares for blasting, by filling the hole in which the charge is placed.

An instrument used in tamping; a tamping iron.

To meddle; to be busy; to try little experiments.

To meddle so as to alter, injure, or vitiate a thing.

To deal unfairly; to practice secretly; to use bribery.