/jɔ:n ||; jɔn/verb [I] to open your mouth wide and breathe in deeply, especially when you are tired or bored 打哈欠: I kept yawning all through the lecture. 整节课我都在打哈欠。 yawn noun [C]: ‘How much longer will it take?’ he said with a yawn. 他边打哈欠边说：“还要多久？”