verb (used with object)
to bring (one's own liquor) to a restaurant or club, especially one that has no liquor license.
to bring (one's lunch) to work or elsewhere, usually in a small brown paper bag.
verb (used without object)
to carry one's lunch in a brown paper bag.
brought to work, usually in a small brown paper bag: a brown-bag lunch.
brown-bag it, to bring one's lunch to work or elsewhere, especially in a brown paper bag.