From Middle English trouthe, truthe, trewthe, treowthe, from Old English trēowþ, trīewþ, from Proto-Germanic *triwwiþō ("promise, covenant, contract"), from Proto-Indo-European *drū- ("tree"), from Proto-Indo-European *deru- ("firm, solid"), equivalent to true + -th. Cognate with Norwegian trygd ("trustworthiness, security, insurance"), Icelandic tryggð ("loyalty, fidelity").
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