刎 Origin — Chinese Character Wiki

wěn

cut throat

Phonosemantic compound. 刂 represents the meaning and 勿 represents the sound.

Components

刂 Meaning component

dāo knife

刂 is a component form of 刀.

勿 Sound component

wù, mò must not

Change in sound

刎 and 勿 don't sound similar in modern Mandarin due to historical phonetic changes. They were more similar in Middle Chinese.
刎 miə̌n
勿 mjut

Regular Modern

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	Middle Chinese	Old Chinese
Zhengzhang		mɯnʔ
Unicode	miə̌n

《說文新附》：“刎，剄也。从刀，勿聲。”