INFORMATION › used to ask for information about something: What's this? What time is it? What happened?
THE THING › used to refer to something without naming it: I heard what he said. Do you know what I mean? What I like most about her is her honesty.
NOT HEARD informal › used when you have not heard what someone has said and you want them to repeat it. Some people think this use is not very polite: "Do you want a drink Tom?" "What?"
REPLY informal › used to ask what someone wants when they call you: "Hey Jenny?" "Yes, what?"
what a/an ... › used to give your opinion, especially when you have strong feelings about something: What a mess! What an awful day!
what about...? › used to suggest something: What about asking Martin to help?
what ... for? › used to ask about the reason for something: What are you doing that for? "We really need a bigger car." "What for?"
what if...? › used to ask about something that could happen in the future, especially something bad: What if I don't pass my exams?
what's up (with sb) informal › used to ask why someone is unhappy or angry: What's up, Angie? You look troubled.
what with informal › used to talk about the reasons for a particular situation, especially a bad or difficult situation: I'm tired, what with travelling all day yesterday and sleeping badly.
what's more › used to add something surprising or interesting to what you have just said