tamper: Meaning and Definition of

tam•per

1. to meddle, esp. for the purpose of altering, damaging, or misusing (usually fol. by with): Someone has been tampering with the lock.
2. to make changes in something, esp. in order to falsify (usually fol. by with): to tamper with official records.
3. to engage secretly or improperly in something.
4. 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

1. a person or thing that tamps.