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Phrase(s): Not if I see you sooner. [and] Not if I see you first.
Inf. a response to I’ll see you later. (This means you will not see me if I see you first, because I will avoid you.) • Tom: See you later. Mary: Not if I see you sooner. • John: Okay. If you want to argue, I’ll just leave. See you later. Mary: Not if I see you first.
McGrawhill's American Idioms And Phrasal Verbs