Etymology
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*kele- (2)
*kelə-, Proto-Indo-European root meaning "to shout." Perhaps imitative.

It forms all or part of: acclaim; acclamation; Aufklarung; calendar; chiaroscuro; claim; Claire; clairvoyance; clairvoyant; clamor; Clara; claret; clarify; clarinet; clarion; clarity; class; clear; cledonism; conciliate; conciliation; council; declaim; declare; disclaim; ecclesiastic; eclair; exclaim; glair; hale (v.); halyard; intercalate; haul; keelhaul; low (v.); nomenclature; paraclete; proclaim; reclaim; reconcile.

It is the hypothetical source of/evidence for its existence is provided by: Sanskrit usakala "cock," literally "dawn-calling;" Latin calare "to announce solemnly, call out," clamare "to cry out, shout, proclaim;" Middle Irish cailech "cock;" Greek kalein "to call," kelados "noise," kledon "report, fame;" Old High German halan "to call;" Old English hlowan "to low, make a noise like a cow;" Lithuanian kalba "language."
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lower (v.2)
"to look dark and menacing," also lour, from Middle English louren, luren "to frown, scowl" (early 13c.), "to lurk" (mid-15c.), from Old English *luran or from its cognates, Middle Low German luren, Middle Dutch loeren "lie in wait." The form perhaps has been assimilated to lower (v.1). Related: Lowered; lowering.
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blues (n.2)
"depression, low spirits," 1741, from blue (adj.1) in the sense "low-spirited" (c. 1400).
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moo (v.)

"to make the characteristic cry of a cow, to low," 1540s, of imitative origin (compare Latin mūgire "to low, moo," Lithuanian mūkiu "to bellow," Middle High German mūhen "to low, bellow," and see PIE root *gwou-). Related: Mooed; mooing. The noun "the low of a cow" is from 1789. Baby-talk moo-cow (n.) "a cow" is attested from 1812.

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base (adj.)
late 14c., "low, of little height," from Old French bas "low, lowly, mean," from Late Latin bassus "thick, stumpy, low" (used only as a cognomen in classical Latin, humilis being there the usual word for "low in stature or position"), possibly from Oscan, or Celtic, or related to Greek basson, comparative of bathys "deep."

Meaning "low on the social scale" is from late 15c.; that of "low in the moral scale" is first attested 1530s in English. Meaning "benefiting an inferior person or thing, unworthy" is from 1590s. Base metals (c. 1600) were worthless in contrast to noble or precious metals. Related: Basely.
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bass (adj.)
late 14c., of things, "low, not high," from Late Latin bassus "short, low" (see base (adj.)). Meaning "low in social scale or rank" is recorded from late 14c. Of voices and music notes, "low in tone" from mid-15c. (technically, ranging from the E flat below the bass stave to the F above it), infuenced by Italian basso.
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decolletage (n.)

1888, "low-cut neck of a bodice" (from 1883 as a French word in English), from French décolletage, from décolleté "low-necked" (see decollete). Hence also "exposure of the neck and shoulders" (1894).

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underestimate (v.)
1812, "to estimate at too low an amount," from under + estimate (v.). Meaning "to rank too low, undervalue" is recorded from 1850. Related: Underestimated; underestimating.
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croak (n.)

"a low, hoarse, guttural sound," 1560s, from croak (v.).

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pizzle (n.)
"penis of a bull used as a flogging instrument," 1520s, from Low German pesel or Flemish pezel, diminutive of root of Dutch pees "sinew," from Old Low German root *pisa.
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