Shallow
来自Big Physics
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late Middle English: obscurely related to shoal2.
wiktionary
From 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”). [1] Related to Low German Scholl(“shallow water”). See also shoal.
etymonline
shallow (adj.)
c. 1400, schalowe "not deep," probably from or related to Old English sceald (see shoal (n.)). Of breathing, attested from 1875; of thought or feeling, "superficial," by 1580s. The noun, usually shallows, is first recorded 1570s, from the adjective.
