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The verb is derived from Late Middle English fraien (“to beat so as to cause bruising, to bruise; to crush; to rub; to wear, wear off”), borrowed from Old French fraier, freier, freiier (modern French frayer (“to clear, open up (a path, etc.); (figuratively) to find one’s way through (something); (obsolete) to rub”)), from Latin fricāre, the present active infinitive of fricō (“to chafe; to rub”), an intensive form of friō (“to break into pieces, crumble; to rub”), ultimately from Proto-Indo-European *bʰreyH- (“to cut”). Sense 1.2 (“to force or make (a path, way, etc.) through”) is derived from modern French frayer: see above. The noun is derived from the verb.

From Late Middle English fraien (“to attack, invade; to make an attack; to brawl, fight; to make a loud noise (?); to frighten, terrify; to be frightened of (something), fear”), an aphetic variant of affraien (“to attack, invade; to harass; to brawl, fight; to riot; to reproach; to frighten, terrify; to be frightened of (something), fear; to alarm, disturb; to arouse, awaken, excite”) (whence affray), from Anglo-Norman affraier, afrayer (“to frighten, terrify; to disquiet; to disturb”) [and other forms], a variant of effreier, esfreier [and other forms], and Old French effreer, esfreer (“to frighten, scare; to be afraid”) [and other forms] (modern French effrayer), from Vulgar Latin *exfridāre, from Latin ex- (prefix indicating privation) + Frankish *friþu (“peace”) (from Proto-Germanic *friþuz (“peace, tranquility; refuge, sanctuary”), ultimately from Proto-Indo-European *preyH- (“to love; to please”)).

From Late Middle English frai (“an assault, attack; a brawl, fight; disturbance, uproar; fine for assault or breach of the peace”), an aphetic variant of affrai, effrai (“an assault, attack; a brawl, fight; disturbance, uproar; public disturbance, riot; dismay; fear; something frightening”), then: * from affraien (verb); and * from Anglo-Norman affrai, affrei [and other forms], a variant of effray, effrei, esfrei, esfroi, Middle French effray, esfroi, and Old French effrei, esfrei, esfroi (“breach of the peace, disturbance; noise; dread, terror”) (modern French effroi (“(literary) dread, terror”)), from Old French effreer, esfreer (verb). See further at etymology 2.

An aphetic variant of defray.