To deliberately alter a system's logic, data, or control information to cause the system to perform unauthorized functions or services.

"meddle, interfere," 1560s, figurative use of tamper "to work in clay, etc., so as to mix it thoroughly," probably originally a variant of temper (v.), which is how it often was sp [..]

"one who or that which tamps," 1864, agent noun from tamp (v.).

An on-track machine used to compact the ballast under the sleepers.

to meddle or interfere with something

  In espresso brewing, the small, pestle-like device with a round, flat end used to distribute and compress the ground coffee inside the filter basket.

1 : to bring improper influence to bear (as by bribery or intimidation) used with with [ed with the jurors] 2 : to alter or interfere in an unauthorized or improper manner used with with [ed with ...

EVIDENT LABELS-

Used for compressing ground coffee inside the filter basket prior to brewing. May be a hand or machine operated.

a metal device used for compressing coffee inside a filter basket before the beginning of the brewing operation.

(v) play around with or alter or falsify, usually secretively or dishonestly(v) intrude in other people's affairs or business; interfere unwantedly(n) a tool for tamping (e.g., for tamping tobacc [..]

A power driven machine for compacting ballast under ties.

Mechanised rail vehicle which lifts and straightens track.

the device used to tamp a bed of loose, finely ground coffee in a portafilter, in preparation for brewing espresso. Most espresso machines include a plastic tamper as an accessory, and after market ta [..]

Therapeutic goods are tampered with if:

This term is used to suggest improper interference such as to tamper with a legal document.