tamper

1 [tam-per]
verb (used without object)
1.
to meddle, especially for the purpose of altering, damaging, or misusing (usually followed by with ): Someone has been tampering with the lock.
2.
to make changes in something, especially in order to falsify (usually followed by with ): to tamper with official records.
3.
to engage secretly or improperly in something.
4.
to engage in underhand or corrupt dealings, especially in order to influence improperly (usually followed by with ): Any lawyer who tries to tamper with a jury should be disbarred.

Origin:
1560–70; probably variant of temper (v.)

tamperer, noun
untampered, adjective


1. interfere.
Dictionary.com Unabridged

tamper

2 [tam-per]
noun
a person or thing that tamps.

Origin:
tamp + -er1

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
tamper1 (ˈtæmpə)
 
vb
1.  (usually foll by with) to interfere or meddle
2.  to use corrupt practices such as bribery or blackmail
3.  (usually foll by with) to attempt to influence or corrupt, esp by bribery: to tamper with the jury
 
[C16: alteration of temper (verb)]
 
'tamperer1
 
n

tamper2 (ˈtæmpə)
 
n
1.  a person or thing that tamps, esp an instrument for packing down tobacco in a pipe
2.  a casing around the core of a nuclear weapon to increase its efficiency by reflecting neutrons and delaying the expansion

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Etymonline
Word Origin & History

tamper
1567, figurative use of tamper "to work in clay, etc., so as to mix it thoroughly," probably originally a variant of temper (q.v.), which is how it was initially spelled. Perhaps it is a dialectal workmen's pronunciation. Tamperproof is recorded from 1886.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Given root-beer drinkers' fierce attachment to their beverage, it's the unwise
  brew master who dares to tamper with a recipe.
Trying to manipulate dreams is nothing but attempts to tamper with the memory.
It could even be used to sneak up on and tamper with enemy satellites.
Whatever the process, the euro zone will be tempted to tamper with the single
  market.
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