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fight [fight 词源字典]: fight: [OE] The deadly earnestness of fighting seems to have had its etymological origins in the rather petty act of pulling someone’s hair. Fight, together with German fechten and Dutch vechten, goes back to a prehistoric Germanic *fekhtan, which appears to come from the same ultimate source as Latin pectere ‘comb’ and Greek péko ‘comb’.

The missing links in the apparently far-fetched semantic chain between ‘fighting’ and ‘combing’ are provided by such words as Spanish pelear ‘fight, quarrel’, a derivative of pelo ‘hair’, which originally meant ‘pull hair’; German raufen ‘pull out, pluck’, which when used reflexively means ‘fight’; and English tussle, which originally meant ‘pull roughly’, and may be related to tousle.
[fight etymology, fight origin, 英语词源]
earnest (adj.1): from Old English eornoste (adj.) "zealous, serious," or from Old English noun eornost "seriousness, serious intent" (surviving only in the phrase in earnest), from Proto-Germanic *er-n-os-ti- (cognates: Old Saxon ernust, Old Frisian ernst, Old High German arnust "seriousness, firmness, struggle," German Ernst "seriousness;" Gothic arniba "safely, securely;" Old Norse ern "able, vigorous," jarna "fight, combat"), perhaps from PIE root *er- (1) "to move, set in motion." The proper name Ernest (literally "resolute") is from the same root. Related: Earnestness.
Ernest: masc. proper name, from French Ernest, which is of German origin (compare Old High German Ernust, German Ernst), literally "earnestness" (see earnest). Among the top 50 names for boys born in U.S. from 1880 through 1933.
instance (n.): mid-14c., "urgency," from Old French instance "eagerness, anxiety, solicitation" (13c.), from Latin instantia "presence, effort intention; earnestness, urgency," literally "a standing near," from instans (see instant). In Scholastic logic, "a fact or example" (early 15c.), from Medieval Latin instantia, used to translate Greek enstasis. This led to use in phrase for instance "as an example" (1650s), and the noun phrase To give (someone) a for instance (1953, American English).
solemn (adj.): mid-14c., "performed with due religious ceremony or reverence, sacred, devoted to religious observances," also, of a vow, etc., "made under religious sanction, binding," from Old French solempne (12c., Modern French solennel) and directly from Latin sollemnis "annual, established, religiously fixed, formal, ceremonial, traditional," perhaps related to sollus "whole" (see safe (adj.)).

"The explanation that Latin sollemnis was formed from sollus whole + annus year is not considered valid" [Barnhart], but some assimilation via folk-etymology is possible. In Middle English also "famous, important; imposing, grand," hence Chaucer's friar, a ful solempne man. Meaning "marked by seriousness or earnestness" is from late 14c.; sense of "fitted to inspire devout reflection" is from c. 1400. Related: Solemnly.