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To eat one's midday meal at some restaurant or other location away from one's home or office. If you're trying to save money, the first step you could take is to stop lunching out every day—do you realize how much that costs you each week? Once a month, the whole department lunches out somewhere together.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
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.
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.