Etymology 1 
Imitative, first attested 1846
- To cry, as a calf or sheep; to bleat; to make a senseless noise; to talk inconsiderately.
- To produce an overrich or overblown sound on a brass instrument such as a trumpet, trombone, or tuba.
Etymology 2 
- (In the context of Soviet or Russian society) Connections; relationships; one's social or business network.
- To open a new business in Russia you need blat.
From Medieval Latin blādum, from Frankish *blād (“field produce”), from Proto-Germanic *blēdaz, *blēdō (“flower, leaf”), from Proto-Indo-European *bhlēdh-, *bhlōw-, *bhol- (“to flower; leaf”). Compare French blé.
- Rhymes: -at
blat m (uncountable)
Old High German 
blat n (plural bletir)