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clean

/kliːn/

Free from dirt, impurity, or moral wrongdoing

From West Germanic, ultimately uncertain Indo-European origin clean (Bright).

noun
verb
adjective
adverb
clean
Proto-Indo-European
Verified
*gel- “to gleam”
reconstructed
Reconstructed root proposed for brightness and shining

from PIE root *gel- "bright, gleaming" (source also of Greek glene "eyeball," Old Irish gel "bright"). But Boutkan...

+1 more source
Proto-Indo-European
Verified
*glēy- “gleaming”
reconstructed
A proposed related gleaming form

from Proto-Indo-European *glēy- (“gleaming”)

Old English
Verified
clǣne
“Clean, pure”; also used for moral and ceremonial purity

from Old English clǣne (“clean, pure”)

Middle English
Verified
clene, clane
The direct medieval forms that developed into modern clean

from Middle English clene, clane

Modern English
clean

Picture an Old English speaker in the early medieval period calling something clǣne: it could be free of mud, morally innocent, or acceptable under food laws. The word probably belongs to a Germanic family associated with shining or brightness, which may connect it to gleam and glow—but scholars disagree, and some doubt that the “clean” family is truly related to German klein, “small.” That possible connection produces a wonderfully strange linguistic split: English kept the sense “pure,” while German and Dutch kept a sense closer to “small, delicate, or fine.” By the fifteenth century clean had become a verb, and by 1919 American English had given us come clean: confessing turns hidden dirt into visible truth.

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