[blab] Informal.
verb (used with object), blabbed, blabbing.
to reveal indiscreetly and thoughtlessly: They blabbed my confidences to everyone.
verb (used without object), blabbed, blabbing.
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.
Also, blabber [blab-er] .

1325–75; Middle English blabbe (noun), perhaps back formation from blaberen to blabber; cognate with Old Norse blabbra, German plappern Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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World English Dictionary
blab (blæb)
vb , blabs, blabbing, blabbed
1.  to divulge (secrets) indiscreetly
2.  (intr) to chatter thoughtlessly; prattle
3.  blabber a less common word for blabber
[C14: of Germanic origin; compare Old High German blabbizōn, Icelandic blabbra]
n, —adj

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

1530s, from M.E. noun blabbe "one who does not control his tongue" (late 14c.), probably echoic.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Abbreviations & Acronyms
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The American Heritage® Abbreviations Dictionary, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Example sentences
One has only to blab in his cups and it all collapses.
All the while, campers blab on their cellphones to friends and family and other reporters.
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