抖瑟 Origin — Chinese Character Wiki

dǒusè

shiver

dǒu tremble

Phonosemantic compound. 扌 represents the meaning and 斗 represents the sound.

扌 Meaning component

shou, shǒu hand

扌 is a component form of 手.

斗 Sound component

dòu ladle

	Old Chinese
Zhengzhang	toːʔ

Phonosemantic compound. A depiction of movable frets of an stringed instrument represents the meaning and 必 represents the sound.

◎ Iconic component

characterless component

Depicts the movable frets of a stringed instrument. Modern form looks like unrelated 玨.

必 Sound component

bì surely

Change in sound

瑟 and 必 don't sound similar in modern Mandarin due to historical phonetic changes. They were more similar in Middle Chinese.
瑟 srit
必 pjit

Regular Modern

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	Middle Chinese	Old Chinese	Gloss
Baxter-Sagart	srit	[s.m]ri[t]	lute

《說文》：“瑟，庖犧所作弦樂也。从珡，必聲。”