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haymaker (n.)

mid-15c. as the name of an agricultural occupation, "one who cuts and dries grass" (hay-making is attested from c. 1400); 1910 in the sense of "very strong blow with the fist," from hay + agent noun of make; the punch probably so called for resemblance to the wide swinging stroke of a scythe. Haymaker punch attested from 1907.

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Definitions of haymaker from WordNet

haymaker (n.)
a farm machine that treats hay to cause more rapid and even drying;
Synonyms: hay conditioner
haymaker (n.)
a hard punch that renders the opponent unable to continue boxing;
Synonyms: knockout punch / KO punch / Sunday punch
From wordnet.princeton.edu