擦撞 Origin — Chinese Character Wiki

cāzhuàng

sideswipe

cā wipe

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

扌 Meaning component

shou, shǒu hand

扌 is a component form of 手.

察 Sound component

chá examine

	Old Chinese
Zhengzhang	sʰlaːd

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

扌 Meaning component

shou, shǒu hand

扌 is a component form of 手.

童 Sound component

tóng child

Change in sound

撞 and 童 don't sound similar in modern Mandarin due to historical phonetic changes. They were more similar in Middle Chinese.
撞 draewng
童 duwng

Regular Modern

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	Middle Chinese	Old Chinese	Gloss
Baxter-Sagart	draewng	[N-t]ˤ<r>oŋ	strike
	draewngH	N-tˤ<r>oŋ-s	strike

《說文》：“撞，卂擣也。从手，童聲。”