熠耀 Origin — Dong Chinese Dictionary

yìyào

shine

yì bright and sparkling

Phonosemantic compound. 火 represents the meaning and 習 represents the sound.

火 Meaning component

huǒ fire

習 Sound component

xí to practice

Regular Modern

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	Old Chinese
Zhengzhang	ɢrub
	lub

盛光也。从火習聲。《詩》曰：“熠熠宵行。”

Phonosemantic compound. 光 represents the meaning and 翟 represents the sound.

光 Meaning component

guāng light

翟 Sound component

dí, zhái a kind of pheasant

Change in sound

耀 and 翟 don't sound similar in modern Mandarin due to historical phonetic changes. They were more similar in Old Chinese.
耀 *lewk-s
翟 *lˤewk

	Middle Chinese	Old Chinese	Gloss
Baxter-Sagart	yewH	lewk-s	shine