尻 Origin — Chinese Character Wiki

kāo

end of spine

Components

尸 Meaning component

shī sitting person

body

九 Sound component

jiǔ nine

Change in sound

尻 and 九 don't sound similar in modern Mandarin due to historical phonetic changes. They were more similar in Old Chinese.
尻 *[k]ʰˤu
九 *[k]uʔ

Regular Modern

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	Middle Chinese	Old Chinese	Gloss
Baxter-Sagart	khaw	[k]ʰˤu	rump

《說文》：“尻，也。从尸，九聲。”