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Phrase(s): Tomorrow never comes.
Prov. When the day arrives that you are now calling "tomorrow," you will call that day "today" and a different day will be called "tomorrow." (Therefore, you should not resolve to do something tomorrow, since that day will never arrive.) • Jill: When are you going to go to lunch with me? Jane: Tomorrow. Jill: Tomorrow never comes.
McGrawhill's American Idioms And Phrasal Verbs