Old English treowan "to trust in, believe, hope, be confident; persuade, suggest; make true; be faithful (to), confederate with," from treow "faith, belief," from Proto-Germanic *treuwaz "having or characterized by good faith" (source also of Old Saxon truon, Old Frisian trouwa, Dutch vertrouwen "trust," Old High German triuwen, German trauen "hope, believe, trust"), "having or characterized by good faith," from PIE *drew-o-, a suffixed form of the root *deru- "be firm, solid, steadfast."
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