Green’s Dictionary of Slang

bleat v.

[SE bleat, of a sheep, to cry; note mid-19C SE use bleat, to propose]

1. [mid-19C+] (orig. milit.) to complain, to whinge.

2. [20C+] to inform on someone.

SE in slang uses

In compounds

bleating cheat (n.) (also bleating chete, blaring cheat) [cheat n. (1)]

[mid-16C–late 19C] (UK Und.) a sheep.

bleating cull (n.) (also bleats) [cull n.1 (4)]

[mid-18C–early 19C] a sheep-stealer.

bleating marching (n.)

(UK Und.) sheep-stealing.

bleating rig (n.) (also bleatem rig) [rig n.2 (1)]

[18C–early 19C] (UK Und.) sheep-stealing.