The loud, distinctive braying sound made by a donkey or mule.
An onomatopoeia—a word that imitates the sound it describes; it mimics the actual bray of a donkey.
Onomatopoeia like 'heehaw' are among the oldest types of words, used across many languages to imitate animal sounds—kids learn them before they learn most other words because they're directly connected to the real world.
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