tamper with

tamper with  {v.}
1. To meddle with (something); handle ignorantly or foolishly.
He tampered with the insides of his watch and ruined it.
2. To secretly get someone to do or say wrong things, especially by giving him money, or by threatening to hurt him.
A friend of the man being tried in court tampered with a witness.
Categories: hurt verb

'tamper with' on video