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1. verb To pack one's own food (e.g., in a brown paper bag), especially lunch, usually for work or school. People who brown bag it each day eat healthier foods than those who go out for lunch.
2. noun Such a lunch. Aw man, I forgot my brown bag, so I'll have to buy lunch after all.
3. adjective Describing a gathering in which people bring their own bag lunches. The phrase can be hyphenated in this usage. Can we go out to a restaurant for a change? I'm sick of these brown-bag meetings.
Packing one's own food (e.g., in a brown paper bag), especially lunch, usually for work or school. Ever since I started brown-bagging it, I've been eating much healthier foods than when I used to go out for lunch.