Third-person singular or plural of blat; makes a bleating or crude noise, or talks loudly.
From 'blat,' possibly imitative in origin (resembling the sound itself). 'Blat' itself may relate to 'bleat' or to the sound of a brass instrument played badly.
Onomatopoeia like 'blat' show us that language captures real sounds—a badly played trumpet really does go 'BLAT!' The word makes you hear the exact noise it describes.
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