批改 Origin — Dong Chinese Dictionary

pīgǎi

mark

pī criticize

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

扌 Meaning component

shou, shǒu hand

扌 is a component form of 手.

比 Sound component

bǐ to compare

	Middle Chinese	Old Chinese
Zhengzhang		pʰiː
Unicode	pei

Phonosemantic compound. 攵 represents the meaning and 己 represents the sound.

己 Sound component

jǐ self

Change in sound

改 and 己 don't sound similar in modern Mandarin due to historical phonetic changes. They were more similar in Middle Chinese.
改 kojX
己 kiX

攵 Meaning component

pū tap

攵 is a component form of 攴.

Regular Modern

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	Middle Chinese	Old Chinese	Gloss
Baxter-Sagart	kojX	C.qˤəʔ	change (v.)

《說文》：“改，更也。从攴、己。”