Green’s Dictionary of Slang

1. (US tramp) of a beggar, obtaining a free meal from someone whom one solicits for a donation.

1991

(con. 1920s) O.D. Brooks Legs 86: We had pocketed three dollars and change and had a run-in. That’s when the guy you beg from takes you to the nearest restaurant and buys you a meal.

2. (UK Und.) a hiding place for stolen goods.

1955

B. Hill Boss of Britain’s Underworld 93: That garage we’ve got as a run-in now might be tumbled by the law one day.