the world > action or operation > doing > activity or occupation > acting in another's business or intervention > act in another's business or intervene [verb (intransitive)] > interfere or meddle > improperly or tamper (2)
intransitive. To have to do or interfere with improperly; to meddle with (a thing).
intransitive to practise on (also upon) —. To tamper with, to corrupt. Obsolete. rare.