tamper

(noun) a tool for tamping (e.g., for tamping tobacco into a pipe bowl or a charge into a drill hole etc.). Synonyms: tamp, tamping bar.

(verb) play around with or alter or falsify, usually secretively or dishonestly. Synonyms: fiddle, monkey. Examples: "Someone tampered with the documents on my desk." "The reporter fiddle with the facts."

(verb) intrude in other people's affairs or business; interfere unwantedly. Synonyms: meddle. Example: "Don't meddle in my affairs!."