slight yawn; half-suppressed yawn
A yawn that is not fully open or is stifled, often involuntary or done discreetly.
I let out a slight yawn during the meeting.
She stifled a half-yawn.
Standard kanji-kana mixed spelling.
Full kanji spelling; 欠伸 is less common than kana あくび.
Compound of 生 (nama, 'raw, half-hearted') and あくび (akubi, 'yawn'). The prefix 生 adds a nuance of something incomplete or not fully realized.