to set upon in a forceful, violent, hostile, or aggressive way, with or without a weapon; begin fighting with: He attacked him with his bare hands.
to begin hostilities against; start an offensive against: to attack the enemy.
to blame or abuse violently or bitterly.
to direct unfavorable criticism against; criticize severely; argue with strongly: He attacked his opponent's statement.
to try to destroy, esp. with verbal abuse: to attack the mayor's reputation.
to set about (a task) or go to work on (a thing) vigorously: to attack housecleaning; to attack the hamburger hungrily.
(of disease, destructive agencies, etc.) to begin to affect.