n.
Function: noun
Date: 1602
1 : GAP , CAVITY
2 : an opening of the mouth wide while taking a deep breath often as an involuntary reaction to fatigue or boredom also : a reaction resembling a yawn <a ⋯ success at the box office but drew only yawn s from critics ― Current Biog. >
3 : 5 BORE <this book is kind of a yawn ― Ilene L. Cooper>