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aftermath [aftermath 词源字典]: aftermath: [16] Originally, and literally, an aftermath was a second crop of grass or similar grazing vegetation, grown after an earlier crop in the same season had been harvested. Already by the mid 17th century it had taken on the figurative connotations of ‘resulting condition’ which are today its only living sense. The -math element comes from Old English mǣth ‘mowing’, a noun descended from the Germanic base *mǣ, source of English mow.
=> mow[aftermath etymology, aftermath origin, 英语词源]
aftermath (n.): 1520s, originally a second crop of grass grown after the first had been harvested, from after + -math, a dialectal word, from Old English mæð "a mowing, cutting of grass" (see math (n.2)). Figurative sense by 1650s. Compare French regain "aftermath," from re- + Old French gain, gaain "grass which grows in meadows that have been mown," from Frankish or some other Germanic source similar to Old High German weida "grass, pasture"
fog (n.2): "long grass, second growth of grass after mowing," late 14c., probably of Scandinavian origin; compare Norwegian fogg "long grass in a moist hollow," Icelandic fuki "rotten sea grass." A connection to fog (n.1) via a notion of long grass growing in moist dells of northern Europe is tempting but not proven. Watkins suggests derivation from PIE *pu- (2) "to rot, decay" (see foul (adj.)).
math (n.2): "a mowing," Old English mæð "mowing, cutting of grass," from Proto-Germanic *mediz (cognates: Old Frisian meth, Old High German mad, German Mahd "mowing, hay crop"), from PIE *me- (4) "to cut grass" (see mow (v.)).
mow (v.): Old English mawan "to mow" (class VII strong verb; past tense meow, past participle mawen), from Proto-Germanic *mæanan (cognates: Middle Low German maeyen, Dutch maaien, Old High German maen, German mähen "to mow," Old English mæd "meadow"), from PIE root *me- (4) "to mow, to cut grass or grain" (cognates: poetic Greek amao, Latin metere "to reap, mow, crop," Italian mietere, Old Irish meithleorai "reapers," Welsh medi). Related: Mowed; mown; mowing.
slaughter (n.): c. 1300, "killing of a cattle or sheep for food, killing of a person," from a Scandinavian *slahtr, akin to Old Norse slatr "a butchering, butcher meat," slatra "to slaughter," slattr "a mowing" from Proto-Germanic *slukhtis, related to Old Norse sla "to strike" (see slay (v.)) + formative suffix (as in laugh/laughter). Meaning "killing of a large number of persons in battle" is attested from mid-14c. Old English had slieht "stroke, slaughter, murder, death; animals for slaughter;" as in sliehtswyn "pig for killing."