v. 25B6; verb
she saw them tampering with her car : INTERFERE, monkey around, meddle, tinker, fiddle, fool around, play around; doctor, alter, change, adjust, damage, deface, vandalize; informal mess about/around; Brit. informal muck about/around.
the defendant tampered with the jury : INFLUENCE, get at, rig, manipulate, bribe, corrupt, bias; informal fix; Brit. informal nobble.