Tamper (verb)

1. To interfere with something, usually in a way that is improper or detrimental.
2. To manipulate or alter something, especially in a way that affects its proper functioning.

Origin:

From the old french word tamponner meaning "to beat, strike".

Examples:

1. The criminal was accused of tampering with the evidence.
2. The engine was damaged because someone had tampered with the wiring.
3. The athlete was caught tampering with their equipment.
4. The employee was fired for tampering with the company's financial records.
5. The investigator discovered that the data had been tampered with.