The Collaborative International Dictionary of English v.0.48:

Blat \Blat\, v. i.
   To cry, as a calf or sheep; to bleat; to make a senseless
   noise; to talk inconsiderately. [Low]
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Blat \Blat\, v. t.
   To utter inconsiderately. [Low]
   [1913 Webster]

         If I have anything on my mind, I have to blat it right
         out.                                     --W. D.
                                                  Howells.
   [1913 Webster]

WordNet (r) 3.0 (2006):

blat
    v 1: cry plaintively; "The lambs were bleating" [syn: bleat,
         blate, blat, baa]

Moby Thesaurus II by Grady Ward, 1.0:

134 Moby Thesaurus words for "blat":
   bark, bawl, bay, beep, belch, bell, bellow, blare, blast, blate,
   bleat, blow, blow the horn, blubber, blurt out, bolt, boom, bray,
   breathe, bugle, burr, buzz, cackle, call, caterwaul, caw, chant,
   chirp, chirr, clang, clangor, clank, clarion, clash, coo, craunch,
   croak, crow, crump, crunch, cry, cry out, drawl, ejaculate,
   exclaim, fanfare, flourish of trumpets, flute, gasp, give tongue,
   give voice, grind, groan, growl, grumble, grunt, hiss, honk, howl,
   jangle, jar, keen, lilt, low, meow, mew, mewl, miaow, moo, mumble,
   murmur, mutter, neigh, nicker, pant, peal, pipe, pule, rasp, roar,
   rumble, scranch, scrape, scratch, screak, scream, screech, scrunch,
   shriek, sibilate, sigh, sing, snap, snarl, snore, snort, sob,
   sound, sound a tattoo, sound taps, squall, squawk, squeak, squeal,
   tantara, tantarara, taps, tarantara, tattoo, thunder, toot, tootle,
   troat, trumpet, trumpet blast, trumpet call, twang, tweedle,
   ululate, wail, warble, whicker, whine, whinny, whisper, whistle,
   wind, yap, yawl, yawp, yell, yelp, yip, yowl



The Jargon File (version 4.4.7, 29 Dec 2003):

blat
 n.

    1. Syn. blast, sense 1.

    2. See thud.


The Free On-line Dictionary of Computing (30 December 2018):

blat

   1. blast.

   2. See thud.

   [Jargon File]