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Phrase(s): Let’s do this again (sometime). [and] We must do this again (sometime).
an expression indicating that one member of a group or pair has enjoyed doing something and would like to do it again. • Bill: What a nice evening. Mary: Yes, let’s do this again sometime. Bill: Bye. Mary: Bye, Bill. • Sue (saying good night): So nice to see both of you. Mary: Oh, yes. We must do this again sometime.
McGrawhill's American Idioms And Phrasal Verbs