noun
high pillow; sleeping with one's head raised
Refers to a pillow that is high or thick, or the act of sleeping with the head elevated. Often appears in the idiom 高枕で寝る (to sleep soundly without worries).
高枕で寝ると首が痛くなることがある。
Sleeping with a high pillow can sometimes cause neck pain.
試験が終わって、やっと高枕で寝られる。
Now that exams are over, I can finally sleep soundly without worries.