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Phrase(s): (I’ve) got to split.
Inf. Fig. I have to leave now. (See also (I) have to shove off for other possible variations.) • Jane: Look at the time! Got to split. Mary: See you later, Jane. • Bill: It’s getting late. I’ve got to split. Sue: Okay, see you tomorrow. Bill: Good night.
McGrawhill's American Idioms And Phrasal Verbs