枕ちん籍せき

noun, noun or participle which takes 'suru'

sleep together; share a bed; use as pillow

Archaic verb/noun meaning to sleep together in the same bed, sometimes with the nuance of using each other's bodies or books as pillows. The specific nuance depends on context; sense 3 (bodies as pillow) and sense 4 (books as pillow) are literary extensions. All are obsolete in modern speech.

• 漢かん詩しでは、友ともと枕ちん籍せきする様よう子すが詠よまれることがある。

  In Chinese poetry, scenes of friends sleeping together using each other as pillows are sometimes depicted.

• 「枕ちん籍せき」は書しょ物もつを枕まくらにして共とも寝ねする意いでも用もちいられた。

  枕籍 was also used to mean sleeping together with books as pillows.