| 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. |
tamper with
Interfere or meddle, especially in a harmful way. For example, If you tamper with that lock it's sure to break. [c. 1600]
Engage in improper or secret dealings, as in He was accused of tampering with the jury. [c. 1600]