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.

An attack made in response to an attack by the opponents

An attack to the groin area of the body.

(aeronautics) The angle between the chord line of an airfoil and the airflow over it; one of the determiners of the amount of lift produced by an airfoil.

To attack in response to an attack by opponents.

(fencing) An attack that is intended to miss or fall short, so as to produce a reaction from the opponent. Also called a false action.

(computer security) An attempt to subvert security by recording legitimate communications and repeating them to try to impersonate a valid user.

(netball) A player allowed in the centre third, goal third including the shooting circle.

(netball) A player allowed in the centre third and goal third, but not the shooting circle.