From Middle English depe, deep, dep, deop, from Old English dēop, from Proto-West Germanic *deup, from Proto-Germanic *deupaz, from Proto-Indo-European, from *dʰewb-.
Cognate with Scots depe ("deep"), Saterland Frisian djoop ("deep"), West Frisian djip ("deep"), Low German deep ("deep"), Dutch diep ("deep"), German tief ("deep"), Danish dyb ("deep"), Norwegian Bokmål dyp ("deep"), Norwegian Nynorsk and Swedish djup ("deep"), Icelandic djúpur ("deep"), Lithuanian dubùs ("deep, hollow"), Albanian det ("sea"), Welsh dwfn ("deep").
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