to enter somebody's land or property unlawfully or without permission
(+ on/upon) to make an unwarranted or uninvited intrusion on or take unfair advantage of something
She didn't want to trespass on his time
archaic or literary (+ against) to commit an offence against a person or break a rule or law
trespasser noun
[Middle English from early French trespasser to pass or go across, from Latin transpassare to pass through, from trans- + passare to pass]