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Phrase(s): lunch off something
to make a lunch by eating something or part of something. • We will be able to lunch off the leftover turkey for days! • I can lunch off what is in the refrigerator. Don’t worry about me. lunch out to eat lunch away from one’s home or away from one’s place of work. • I think I’ll lunch out today. I’m tired of carrying lunches. • I want to lunch out today.
McGrawhill's American Idioms And Phrasal Verbs