Word Origin See more synonyms for blab on Thesaurus.com verb (used with object), blabbed, blab·bing. to reveal indiscreetly and thoughtlessly: They blabbed my confidences to everyone. verb (used without object), blabbed, blab·bing. 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. idle, indiscreet chattering. a person who blabs; blabbermouth.
blab·ber [ blab-er] /ˈblæb ər/
Origin of blab 1325–75; Middle English blabbe (noun), perhaps back formation from blaberen to blabber; cognate with Old Norse blabbra, German plappern
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
British Dictionary definitions for blabbering verb blabs, blabbing or blabbed to divulge (secrets) indiscreetly (intr) to chatter thoughtlessly; prattle 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
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Word Origin and History for blabbering 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