Definition from Wiktionary, the free dictionary
Possibly an ellipsis of "Could you come again with what you just said?" "Come again with what you just said."
- (idiomatic, informal) Could you repeat that? Repeat that please. a polite formula used when one has not heard or understood what has been said
- excuse me (especially US), I beg your pardon (formal), pardon, sorry, what, say again; see also Wikisaurus:say again
could you repeat that
An ellipsis of "Please come back for another visit"
- (idiomatic) Used as a polite farewell to a visitor, inviting a return visit.
- Often used in retail stores and service establishments, especially in hotels and restaurants
polite farewell, inviting return visit