あくび

Etymology 1
Possibly from ; first attested in the of 898­­­–901.

Appears to be derived as the, although this verb form isn't attested until the of 1002.

Noun

 * 1)   a yawn, yawning
 * 2)  the 欠 element in kanji characters
 * 1)  the 欠 element in kanji characters

Idioms

 * : “to bite down and kill a yawn” → to stifle a yawn

Verb

 * 1) to yawn