drop-in: Meaning and Definition of

drop-in

1. a person who or thing that pays an unexpected or uninvited visit: a feeder for squirrels, raccoons, and other drop-ins.
2. a social gathering at which the guests are not expected to stay long: Be sure to stop by our house for a glass of eggnog at our Christmas drop-in.

1. provided for short-term patronage: a drop-in shelter for the homeless.
2. requiring only insertion to be ready for use: a drop-in film cartridge.