1, 2. Blow, stroke, hit, slap refer to a sudden or forceful impact, but differ in their literal and figurative uses. Blow emphasizes the violence of the impact and, figuratively, adverse fortune: a blow from a hammer; a blow to one's hopes. Stroke emphasizes movement as well as impact; it indicates precision or, figuratively, either good fortune or sudden or unexpected pain or misfortune: the stroke of a piston; a stroke of luck, of lightning; a paralytic stroke. Hit, in its current uses, emphasizes the successful result of a literal or figurative blow, impact, or impression, for example in baseball, social life, the theater: a two-base hit; to make a hit with someone; a smash hit. Slap, a blow with the open hand or with something flat, emphasizes the instrument with which the blow is delivered and, often, the resulting sound; figuratively, it connotes an unfriendly or sarcastic statement, action, or attitude: Her coldness was like a slap in the face; the slap of a beaver's tail on the water.

Did you mean blowout?