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English definition of “yawn”

yawn

verb [I] uk   /jɔːn/ us    /jɑːn/
B1 to open the mouth wide and take a lot of air into the lungs and slowly send it out, usually when tired or bored: I can't stop yawning - I must be tired.

yawn

noun uk   /jɔːn/ us    /jɑːn/
[C] an act of yawning: Her eyes watered as she tried to stifle (= stop) a yawn. a yawn [S] informal something or someone that is very boring: We have to go to dinner with Simon's boss on Saturday which is a bit of a yawn.
(Definition of yawn from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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