Sunday punch


noun

Boxing. the most powerful and effective punch of a boxer, especially the punch used in trying to gain a knockout.
anything, as an armed force, line of argument, etc., capable of inflicting a powerful blow on a hostile or opposing person or thing.

Origin of Sunday punch

First recorded in 1930–35

British Dictionary definitions for sunday punch

Sunday punch

noun informal, mainly US

boxing a heavy blow intended to knock out one's opponent
any manoeuvre or action intended to crush an opponent