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Phrase(s): It ’s been.
Inf. a phrase said on leaving a party or other gathering. (A shortening of It’s been lovely or some similar expression.) • Mary: Well, it’s been. We really have to go, though. Andy: So glad you could come over. Bye. • Fred: Bye, you guys. See you. Sally: It’s been. Really it has. Toodle-oo.
McGrawhill's American Idioms And Phrasal Verbs