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From Middle English trien (“to separate out, sift, choose, select, evaluate, try a legal case”), from Anglo-Norman trier, triher, triere (“to divide, separate, choose, select, prove, determine, try a case”), Old French trier (“to choose, pick out or separate from others, sift, cull”), of uncertain origin. Cognate with Occitan triar (“to choose, sort, scrutinise, peel”), Catalan triar (“to pick, choose, decide”). Suggested to be derived from Late Latin *trītāre (“to crush, grind, trample, wear out”), itself derived from Classical Latin trītus (“rubbed, worn down, pulverised”), the past participle of terō, terere (“to rub, wear down, trample”), though this derivation is incompatible with the Occitan form. Additionally, the shift in meaning from "rub, crush, trample" to "pick out, choose, cull" is difficult to explain. One suggestion is that the semantic shift might have originated from a Latin phrase *granum terere ("to tread the corn (in threshing)"; compare Latin trītūra (“rubbing, chafing, friction" also "threshing”)), which has a parallel in the modern French trier le grain (“to sort the grain”). Alternatively, perhaps derived from Vulgar Latin *trīāre, a metathetic alteration of *tīrāre (“to tear off, pull, draw”), whence also Old French tirer (“to draw, pull, pluck, tug, peck at, extract”), Occitan tirar (“to take, draw, retrieve, remove, extract”). Replaced native Middle English cunnen (“to try”) (from Old English cunnian), Middle English fandien (“to try, prove”) (from Old English fandian), and Middle English costnien (“to try, tempt, test”) (from Old English costnian).

From Middle English trye, trie, probably from Old French trié, past participle of Old French trier (“to try”).