杯托 Origin — Chinese Character Wiki

bēituō

saucer

bēi cup

Phonosemantic compound. 木 represents the meaning and 不 represents the sound.

木 Meaning component

mù tree

不 Sound component

bù, bu no

Change in sound

杯 and 不 don't sound similar in modern Mandarin due to historical phonetic changes. They were more similar in Old Chinese.
杯 *pˤə
不 *pə

Regular Modern

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	Middle Chinese	Old Chinese	Gloss
Baxter-Sagart	pwoj	pˤə	cup

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

扌 Meaning component

shou, shǒu hand

扌 is a component form of 手.

乇 Sound component

tuō, zhé to depend on

	Old Chinese
Zhengzhang	l̥ʰaːɡ