1.
a high pillow
A tall, raised pillow. The literal meaning, much less common in everyday speech than the idiomatic use.
2.
sleeping in peace; resting easy; freedom from worry
An idiom meaning to sleep soundly and without anxiety, by extension to be free of worry. Used especially in the expression 高枕で寝る/眠る.
Literally "high pillow." The idiomatic sense comes from the historical idea that one can only afford a comfortable, raised pillow when one has nothing to fear or be vigilant about.
Common collocations
Usage
The figurative sense is far more common in modern Japanese. Often appears in negative form (高枕では寝られない) to express ongoing anxiety.
Similar words
Related Words
Compare:
安眠 (peaceful sleep)