Haymaker in boxing is a powerful and forceful punch intended to knock down an opponent. It is considered an impure punch in boxing because of the time it takes to wind up and gain the force necessary to knock the opponent down.
This kind of punch leaves the boxer vulnerable to a counterpunch if the haymaker doesn’t land, as it often involves a wide, looping motion that can be easily anticipated and countered.
Despite the risk, a well-placed haymaker can be very effective in knocking out an opponent.