drumming
鼚 centers on the sound and action of drumming, specifically a loud, resonant beating of a drum.
鼚 combines 鼓 (drum) and 長 (long), likely suggesting a prolonged or resonant drumming sound.
A drum 鼓 on top and 長 (long) below: imagine a long, sustained drumroll that goes on and on.
For チョウ, picture a drumming chief named Chou leading a long drumroll: Chou -> チョウ, and the drumming echoes.
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