Webster's Revised Unabridged Dictionary · 1913

Tamper

Tamper , noun

1.
One who tamps; specifically, one who prepares for blasting, by filling the hole in which the charge is placed.
2.
An instrument used in tamping; a tamping iron.

Tamper , intransitive verb

[A corruption of temper.]

1.
To meddle; to be busy; to try little experiments; as, to tamper with a disease.
'T is dangerous tampering with a muse. — Roscommon
2.
To meddle so as to alter, injure, or vitiate a thing.
3.
To deal unfairly; to practice secretly; to use bribery.
Others tampered For Fleetwood, Desborough, and Lambert. — Hudibras