To assault; fall upon with force; assail, as with force and arms; begin hostilities against.To endeavor to injure, overthrow, or bring into discredit by any act or proposal, or by unfriendly words or writing, whether by satire, calumny, criticism, or argument: as, to attack a religious belief or a legislative measure; to attack a man or his opinions in a newspaper.To make an onset or attempt upon, in a general sense; begin action upon or in regard to; set about or upon: as, to attack a piece of work or a problem, or (humorously) the dinner.To begin to affect; come or fall upon; seize: said of diseases and other destructive agencies: as, yesterday he was attacked by fever; caries attacked the bones; locusts attacked the crops. Specifically In chem., to cause to decompose or dissolve.Synonyms Set upon, Fall upon, etc. (see assail), assault, beset, besiege, beleaguer, charge upon, engage, challenge, combat. To impugn, criticize, censure.To make an attack or onset: as, the enemy attacked with great boldness.n. A falling on with force or violence, or with calumny, satire, or criticism; an onset; an assault.n. Battle generally; fight.n. An onset of any kind; the initial movement in any active proceeding or contest, as a game of chess, cricket, etc.; in music, specifically, the act (with reference to the manner) of beginning a piece, passage, or phrase, especially by an orchestra.n. The aggressive part of the art of fencing: opposed to defense.n. A seizure by a disease; the onset of a disease.