1.to tamper with sth
(interfere with)+ computer, machine, food product胡乱摆弄；对…做手脚；干扰
He claimed that his briefcase had been tampered with on the flight.他声称他的公文包在飞机上被人翻过。
+ evidence, records, document篡改
I don't want to be accused of tampering with the evidence.我不想被指控篡改证据。
2.to tamper with sb
(use corrupt practices on)用不正当手段影响某人；对某人行贿；敲诈某人
He attempted to tamper with the jury.他企图向陪审团行贿。