1
general::
Phrase(s): I’ll call back later.
a standard phrase indicating that a telephone caller will call again at a later time. • Sally: Is Bill there? Mary (speaking into the telephone): Sorry, he’s not here right now. Sally: I’ll call back later. • John (speaking into the telephone): Hello. Is Fred there? Jane: No. Can I take a message? John: No, thanks. I’ll call back later.
McGrawhill's American Idioms And Phrasal Verbs