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blab

[blab] /blæb/ Informal.
verb (used with object), blabbed, blabbing.
1.
to reveal indiscreetly and thoughtlessly:
They blabbed my confidences to everyone.
verb (used without object), blabbed, blabbing.
2.
to talk or chatter indiscreetly or thoughtlessly:
Don't confide in him, because he blabs. She blabbed so much I couldn't hear the concert.
noun
3.
idle, indiscreet chattering.
4.
a person who blabs; blabbermouth.
Also, blabber
[blab-er] /ˈblæb ər/ (Show IPA)
.
Origin of blab
1325-1375
1325-75; Middle English blabbe (noun), perhaps back formation from blaberen to blabber; cognate with Old Norse blabbra, German plappern
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Based on the Random House Dictionary, © Random House, Inc. 2017.
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British Dictionary definitions for blab

blab

/blæb/
verb blabs, blabbing, blabbed
1.
to divulge (secrets) indiscreetly
2.
(intransitive) to chatter thoughtlessly; prattle
noun
3.
a less common word for blabber (sense 1), blabber (sense 2)
Derived Forms
blabbing, noun, adjective
Word Origin
C14: of Germanic origin; compare Old High German blabbizōn, Icelandic blabbra
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for blab
v.

mid-15c., apparently from Middle English noun blabbe "one who does not control his tongue" (late 13c.), probably echoic. Related: Blabbed; blabbing. The exact relationship between the blabs and blabber is difficult to determine. The noun was "[e]xceedingly common in 16th and 17th c.; unusual in literature since c 1750" [OED].

Online Etymology Dictionary, © 2010 Douglas Harper
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