A push; knock; bump
A leisurely meal between lunch and dinner in the late afternoon or early evening (about 3-5 p.m.), usually instead of lunch or dinner.
To knock against; to hit, punch
A surname.
The origin of "dunch" is uncertain, though it may come from Middle English or North Germanic roots meaning to hit or knock. It is also possibly related to the Old English word denġan, which meant to bang or ding.