尻

kāo
#6,043 most
frequent character
(literary) buttocks, rump, coccyx

Character breakdown

Source: Make Me a Hanzi.

尻 uses 尸 a squatting person as a picture part and 九 jiǔ as a sound part; the sound link is not clear in Mandarin. It first meant the anus. Later it came to mean the buttocks and the tailbone.

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