Meaning

noun the cry made by sheep

verb cry plaintively

originCompare German bäh, mäh; an imitative word. Notes on phonological development The pronunciation /bɑː/ is perhaps a development from earlier /bæː/ reflecting the shift of /æː/ to /ɑː/ during the 18th and 19th centuries. Compare Early Modern English bae, bea, both "to baa", respectively displaying the then current pronunciation of Middle English /aː/ as /æː/ and the failure of Middle English /ɛː/…

Etymology from Wiktionary, CC BY-SA 3.0