what?

Từ điển Oxford Advanced Learner 8th

what? idiom
(informal)
1. used when you have not heard or have not understood sth
• What? I can't hear you.
2. used to show that you have heard sb and to ask what they want
• ‘Mummy!’ ‘What?’ ‘I'm thirsty.’
3. used to express surprise or anger
• ‘It will cost $500.’ ‘What?’
• ‘I asked her to marry me.’ ‘ You what? ’
Main entry: ↑what_idiom