Third-person singular simple present indicative form of counter-attack

(medicine) An incident wherein a person who suffers intermittent experiences of bronchioconstriction undergoes such an experience, usually with a sudden onset.

(computing) An attack that subverts a reputation system by forging identities in peer-to-peer networks.

plural of Sybil attack

plural of salami attack

(computing) An attack against a system that consists of many minor actions (such as stealing small amounts of funds from multiple bank accounts) and is thus relatively difficult to detect.

(military) An attack in which two or more forces attack from multiple sides at once.

(ice hockey) From one team's point of view, the area between the blue line of the other team's half of the rink and the end board behind the other team's goal.

Used other than figuratively or idiomatically: see open, attack: to begin attacking, to commence battle. / (cricket) Of a bowler: to bowl one of the first two overs.

(cardiology) An acute myocardial infarction, sometimes fatal, caused by the sudden occurrence of coronary thrombosis, which obstructs the blood supply to the heart and leads to necrosis of heart muscle tissue.