Yawn
/jˈɔn/
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Definition
(verb) To open the mouth widely and take a long, rather deep breath, often because one is tired or bored, and sometimes accompanied by pandiculation.
Sentence Examples
Cover your mouth when you cough, sneeze, or yawn.
We yawn when we are short of oxygen.
CEFR Practice Quiz
I couldn't help but ____ during the long and several very boring presentation as I was very tired today.