Definition of tampers:
(v) :
(intransitive) To make unauthorized or improper alterations, sometimes causing deliberate damage; to meddle (with something).
(v) :
(intransitive) To try to influence someone, usually in an illegal or devious way; to try to deal (with someone).
(n) :
A person or thing that tamps.
(n) :
A tool used to tamp something down, such as tobacco in a pipe.
(n) :
(rail transport) A railway vehicle used to tamp down ballast.
(v) :
(US, Canada, in professional sports) To discuss future contracts with a player, against league rules.