v. & n.
v.intr. 1 (usu. foll. by on, upon) make an unlawful or unwarrantable intrusion (esp. on land or property). 2 (foll. by on) make unwarrantable claims (shall not trespass on your hospitality). 3 (foll. by against) literary or archaic offend.
n. 1 Law a voluntary wrongful act against the person or property of another, esp. unlawful entry to a person's land or property. 2 archaic a sin or offence. trespass on a person's preserves meddle in another person's affairs. trespasser n.
[ ME f. OF trespasser pass over, trespass, trespas (n.), f. med.L transpassare (as TRANS-, PASS(1)) ]