You meet a girl who you'd like to go out with at a dance club. You ask her on a date, but she doesn't answer. You want to encourage her to answer, so you say this.
Come on! What do you say?
You say "come on" to someone when you're trying to convince them to do something. It's used in casual situations. "Come on" means something like "Don't worry about it; just do it." Here is another example:
Ask this question when you've made an offer to someone, but they're hesitant to take it.
For example, if you're trying to sell your old bicycle to a friend, you can say:
I'll give it to you for a hundred and fifty. What do you say?
Use "What do you say?" after you've made your offer, but before the person you're talking to has given their answer. If they've already said "yes" or "no", it doesn't make sense to ask "What do you say?"
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