As a question, Come again? is used as a request to repeat what was said.
Another way to ask, “What did you say?”/ “I didn’t hear what you said.”/ “Please repeat it.”
A phrase asking someone to repeat a statement, because it wasn’t heard or the truth is being questioned.
1. Sir, did you want to supersize your meal? Come again?
2. Gary, I think you have a hard time hearing lately. Come again?
3. You’re the worst dancer I’ve ever seen. Come again?!
4. Music isn’t to be played as if you’re playing with your feet. Come again?!
discuss, play again, rehash, reiterate, repeat, rephrase, resay, restate, retell, say again, state differently