(idiomatic) Used to ask someone if they are willing to do something.
Let's go to the movies tonight, what do you say?
Synonym: what say you
(idiomatic) Used to remind a child to say a polite expression.
That man just gave you a lovely birthday gift, young lady; what do you say? ― Thank you!
I want cake! ― What do you say? ― Please!
When Aunt Fiona from Florida gave Jordan some candy, Mom said, "What do you say?" and Jordan replied, "Thank you!"
A sign in the yard of a church next door said CHRIST IS THE ANSWER. (The question, of course, is: What do you say when you strike your thumb with a hammer?) Bill Bryson
I didn't know what to say to her. What do you say to people when they ask how it feels to lose everything? When every planet in your solar system has exploded? Sherman Alexie
What do you say when someone has truly inspired you? How do you express to an artist how deeply their work has affected you? Laura Dern
What do you say to your sister who poses in the nude? It's not like you are really itching to see photographs of your sister naked. I mean, it's just something that is not too exciting. Ron Reagan
My body feels young but my mind is very old So what do you say / You can't give me the dreams that are mine anyway / You're half the world away I've been lost, I've been found / But I don't feel down. Noel Gallagher
A lot of people say television holds up a mirror to life, and that's why you see all the drug busts and the killings and the seamier side of life. I personally take the view that it's not sufficient to portray only negative role models. It's not enough to say 'no' to drugs. What do you say 'yes' to? Sherwood Schwartz