To leap upon; specifically, to make a sudden, open, and bold attack upon; attack in a summary manner, and without recourse to the usual forms of war.To offer an indignity to; treat contemptuously, ignominiously, or insolently, either by speech or by action; manifest scorn or contempt for.To leap or jump.To behave with insolent triumph; exult contemptuously: with on, upon, or over.n. The act of leaping on anything.n. An assault; a summary assault; an attack.n. An affront, or a hurt inflicted upon one's self-respect or sensibility; an action or utterance designed to wound one's feelings or ignominiously assail one's self-respect; a manifestation of insolence or contempt intended to provoke resentment; an indignity.n. Contemptuous treatment; outrage.In pathology, to injure; inflict traumatism upon.n. In pathology, external violence which causes a lesion.