忾 Origin — Chinese Character Wiki

kàixì

anger

Phonosemantic compound. 忄 represents the meaning and 气 represents the sound.

Components

忄 Meaning component

xin, xīn heart

忄 is a component form of 心.

气 Sound component

qì, qi air

Change in sound

忾 and 气 don't sound similar in modern Mandarin due to historical phonetic changes. They were more similar in Old Chinese.
忾 qʰrɯl
气 *C.qʰəp-s

	Old Chinese
Zhengzhang	qʰrɯl

Phonosemantic compound. 忄 represents the meaning and 氣 represents the sound.

忄 Meaning component

xin, xīn heart

忄 is a component form of 心.

氣 Sound component

qì, qi air

Change in sound

愾 and 氣 don't sound similar in modern Mandarin due to historical phonetic changes. They were more similar in Middle Chinese.
愾 xj+jH
氣 xj+jH

Regular Modern

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	Middle Chinese	Old Chinese	Gloss
Baxter-Sagart	xj+jH	qʰəp-s	sigh; angry

《說文》：“愾，大息也。从心，从氣，氣亦聲。《詩》曰：‘愾我寤歎。’”