From Middle English trewe, from Old English trīewe, (Mercian) trēowe, from Proto-Germanic *triwwiz (compare Saterland Frisian trjou ("honest"), Dutch getrouw and trouw, German treu, Norwegian and Swedish trygg ("safe, secure’"), from pre-Germanic *drewh₂yos, from Proto-Indo-European *drewh₂- ("steady, firm") (compare Irish dearbh ("sure"), Old Prussian druwis ("faith"), Ancient Greek δροόν ("firm")), extension of *dóru. More at tree.
For the semantic development, compare Latin robustus ("tough") from robur.
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