noun
A person or thing that tamps.
verb
(intransitive) To make unauthorized or improper alterations, sometimes causing deliberate damage; to meddle (with something).
(intransitive) To try to influence someone, usually in an illegal or devious way; to try to deal (with someone).
(dated) To meddle (with something) in order to corrupt or pervert it.
(obsolete) To involve oneself (in a plot, scheme, etc.).
(obsolete) To attempt to practise or administer something (especially medicine) without sufficient knowledge or qualifications.
(US, Canada, in professional sports) To discuss future contracts with a player, against league rules.