The provision of the United State Constitution that vests the power to make treaties in the President with the advice and consent of the Senate, and a concurrence of two-thirds of that body. treble damages See damages. trespass 1n.An illegal act committed against another's person or property; especially entering upon another's land without the owner's permission. 2 n. In common law, a legal suit for injuries resulting from an instance of the first definition. 3v. To enter upon property withou...