tamper with

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Also see: with

tam•per¹ v. [~ + with + object]

to change, esp. without permission:to tamper with a lock.
to make changes, esp. to falsify:to tamper with official records.
to engage in dishonest dealings, esp. in order to influence improperly:accused of tampering with the jury.

tam•per•er, n. [countable]

tam•per¹ v.i.

to meddle, esp. for the purpose of altering, damaging, or misusing (usually fol. by with):Someone has been tampering with the lock.
to make changes in something, esp. in order to falsify (usually fol. by with):to tamper with official records.
to engage secretly or improperly in something.
to engage in underhand or corrupt dealings, esp. in order to influence improperly (usually fol. by with):Any lawyer who tries to tamper with a jury should be disbarred.

tam′per•er, n.

tamp•er² n.

Collins Concise English Dictionary © HarperCollins Publishers::

tamper /ˈtæmpə/ vb (intransitive)

Etymology: 16th Century: alteration of temper (verb)ˈtamperer n

tamper /ˈtæmpə/ n

a person or thing that tamps, esp an instrument for packing down tobacco in a pipe
a casing around the core of a nuclear weapon to increase its efficiency by reflecting neutrons and delaying the expansion

'tamper with' also found in these entries (note: many are not synonyms or translations):

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