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conk (v.): as in conk out, 1918, coined by World War I airmen, perhaps in imitation of the sound of a stalling motor, reinforced by conk (v.) "hit on the head," originally "punch in the nose" (1821), from conk (n.), slang for "nose" (1812), perhaps from fancied resemblance to a conch (pronounced "conk") shell.
punch (n.3): "a quick blow with the fist," by 1570s, probably from punch (v.). In early use also of blows with the foot or jabs with a staff or club. Originally especially of blows that sink in to some degree ("... whom he unmercifully bruises and batters from head to foot: here a slap in the chaps, there a black eye, now a punch in the stomach, and then a kick on the breech," "Monthly Review," 1763). Figurative sense of "forceful, vigorous quality" is recorded from 1911. To beat (someone) to the punch in the figurative sense is from 1915, a metaphor from boxing (attested by 1913). Punch line (also punch-line) is from 1915 (originally in popular-song writing); punch-drunk is from 1915 (alternative form slug-nutty is from 1933).
stomach (n.): late 14c., earlier stomak (early 14c.), "internal pouch into which food is digested," from Old French stomaque, estomac "stomach," from Latin stomachus "throat, gullet; stomach," also "taste, inclination, liking; distaste, dislike;" also "pride, indignation," which were thought to have their origin in that organ (source also of Spanish estómago, Italian stomaco), from Greek stomachos "throat, gullet, esophagus," literally "mouth, opening," from stoma "mouth" (see stoma).

Applied anciently to the openings of various internal organs, especially that of the stomach, then by the later Greek physicians to the stomach itself. The native word is maw. Some 16c. anatomists tried to correct the sense back to "esophagus" and introduce ventricle for what we call the stomach. Meaning "belly, midriff, part of the body that contains the stomach" is from late 14c.

The spelling of the ending of the word was conformed to Latin, but the pronunciation remains as in Middle English. Related: stomachial (1580s); stomachical (c. 1600); stomachic (1650s). Pugilistic stomacher "punch in the stomach" is from 1814; from mid-15c. as "vest or other garment which covers the belly." The Latin figurative senses also were in Middle English (such as "relish, inclination, desire," mid-15c.) or early Modern English. Also sometimes regarded in Middle Ages as the seat of sexual desire.
wind (v.2): "to perceive by scent, get wind of," c. 1400, from wind (n.1). Of horns, etc., "make sound by blowing through," from 1580s. Meaning "tire, put out of breath; render temporarily breathless" is from 1802, originally in pugilism, in reference to the effect of a punch in the stomach. Related: Winded; winding.