To make a harsh, sharp sound like a bird's cry or to chatter loudly and persistently.
From Middle English clawken, imitative origin related to Old English cloccian (to cluck). The word evolved from onomatopoeia—sounds that mimic what they mean—to describe any sharp, repetitive vocal noise.
Clawk belongs to a huge family of 'cluck' words across English that all started from people literally imitating chicken sounds. It's wild how many words in English came from humans just going 'blah blah blah' and deciding that's the word now.
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