The bleating sound that sheep and goats make, or the act of making this sound.
An onomatopoeia—a word created by imitating the sound itself. The 'baa' directly mimics what sheep actually say, making it one of the most literal words in English.
Sheep aren't saying one universal sound—different breeds and individual sheep have slightly different 'baas,' and lambs learn to recognize their mother's specific bleat within hours of birth!
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