To commit an offense or a sin; transgress or err. Law To commit an unlawful injury to the person, property, or rights of another, with actual or implied force or violence, especially to enter onto another's land wrongfully. To infringe on the privacy, time, or attention of another: "I must . . . not trespass too far on the patience of a good-natured critic\u201d ( Henry Fielding). Transgression of a moral or social law, code, or duty. Law The act of trespassing. Law A suit brought for trespassing. An intrusion or infringement on another. See Synonyms at breach.