Meaning

noun a stretch of shallow water

verb make shallow

verb become shallow

originFrom Middle English schalowe (“not deep, shallow”); apparently related to Middle English schalde, schold, scheld, schealde (“shallow”), from Old English sċeald (“shallow”), from Proto-Germanic *skal-, from Proto-Indo-European *(s)kelh₁- (“to parch, dry out”). Related to Low German Scholl (“shallow water”). See also shoal.

Etymology from Wiktionary, CC BY-SA 3.0