noun, noun or participle which takes 'suru', intransitive verb, noun which may take the genitive case particle 'no'
lying on one's side
Formal or literary term for lying down on one's side. In everyday speech, 横になる or 横向きに寝る is more common.
患者はベッドに横臥している。
The patient is lying on their side in bed.
横臥位で休むように言われた。
I was told to rest in a side-lying position.