tampering

(noun) the act of altering something secretly or improperly. Synonyms: meddling.

(verb) play around with or alter or falsify, usually secretively or dishonestly. Synonyms: tamper, 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, tamper. Example: "Don't meddle in my affairs!."