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trustedtrustfultrustfulnesstrustingtrusts
From Middle English trust, trost (“trust, protection”). Long considered a borrowing from Old Norse traust (“confidence, help, protection”), from Proto-Germanic *traustą, but the root vocalism is incompatible, so trust has come to be considered a reflex of an unattested Old English *trust, from a rare zero-grade Proto-Germanic variant of the same root also attested in Middle High German getrüste (“host”). Ultimately from Proto-Indo-European *deru- (“be firm, hard, solid”). Akin to Danish trøst (“comfort, solace”), Saterland Frisian Traast (“comfort, solace”), West Frisian treast (“comfort, sola…
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