Made the characteristic bleating cry of a sheep or goat.
From 'baa' (onomatopoeia mimicking sheep cry) + '-ed' (past tense). The sound itself comes from centuries of observing animal behavior.
The word 'baa' exists in almost every language because babies naturally pick it up imitating sheep—it uses sounds that are easy for humans to make, which is probably why we've been calling sheep by this sound for thousands of years.
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