tamper
🇺🇸
/ˈtæmpər/
🇬🇧
/ˈtæmpə(r)/
To meddle with something, especially in a way that causes harm or reduces its effectiveness.
The mechanic warned against anyone tampering with the car's engine.
To make unauthorized changes to something, often with the aim of deception or causing harm.
There was evidence of tampering with the evidence in the case.