tamper

Meanings

• a tool for tamping (e.g., for tamping tobacco into a pipe bowl or a charge into a drill hole etc.)
• play around with or alter or falsify, usually secretively or dishonestly
  • "Someone tampered with the documents on my desk"
• intrude in other people's affairs or business; interfere unwantedly

Synonyms

fiddle, meddle, monkey, tamp, tamping bar