What does "come again" mean?

A polite formula used when one has not heard or understood what has been said, or to indicate surprise.

What is a synonym for "come again"?

Common synonyms include: alternate, be here again, circle, come and go, come around, come round.

intj, slang

intj, slang ·Moderate ·College level

Intj

1
A polite formula used when one has not heard or understood what has been said, or to indicate surprise. idiomatic, informal
""Who says he did?" / "Aubry." / "Yeah? A guy in for murder? Come again." / "Glad to. Beebe says so too.""
2
Used as a polite farewell to a visitor, inviting a return visit. idiomatic

""Who says he did?" / "Aubry." / "Yeah? A guy in for murder? Come again." / "Glad to. Beebe says so too.""