HAYMAKER
haymaker, knockout punch, KO punch, Sunday punch
(noun) a hard punch that renders the opponent unable to continue boxing
haymaker, hay conditioner
(noun) a farm machine that treats hay to cause more rapid and even drying
Source: WordNet® 3.1
Etymology
Noun
haymaker (plural haymakers)
(agriculture) A person or machine which harvests or prepares tall grass for use as animal fodder.
(informal, fisticuffs) A particularly powerful punch, especially one which knocks down an opponent, thrown like a scythe chop for cutting hay, as agricultural haymakers used to have strong arms.
(figuratively, by extension) Any decisive blow, shock, or forceful action.
Source: Wiktionary
Hay"mak`er, n.
1. One who cuts and cures hay.
2. A machine for curing hay in rainy weather.
Source: Webster’s Unabridged Dictionary 1913 Edition