陪床 Origin — Dong Chinese Dictionary

péichuáng

care for

péi accompany

Phonosemantic compound. 阝 represents the meaning and 咅 represents the sound.

阝 Meaning component

fù hill, place

阝 is a component form of 阜.

咅 Sound component

pǒu to spit out

Change in sound

陪 and 咅 don't sound similar in modern Mandarin due to historical phonetic changes. They were more similar in Old Chinese.
陪 bɯː
咅 pʰɯʔ

Regular Modern

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	Middle Chinese	Old Chinese
Zhengzhang		bɯː
Unicode	bhəi

《說文》：“陪，重土也。一曰滿也。从，咅聲。”

Depicts a bed (爿) made from wood (木). Originally written as 爿 or 牀.

pán, qiáng piece of wood

Depicts a bed.

Change in form

Due to historical stylistic changes, this component is less similar to 爿 than it was in ancient scripts.

木 Meaning component

mù tree