From Longman Dictionary of Contemporary Englishdrop-inˈdrop-in adjective [only before noun] PEWa drop-in place is a place offering a service or support where you can go without having to make arrangements first a drop-in advice centre
Examples from the Corpus
drop-in• As well as hernias, conditions such as cataracts and varicose veins are also being successfully treated on a drop-in basis.• The drop-in center provides food and clothing for the homeless.• They often provide a drop-in centre and sometimes they provide group counselling as well as a link to appropriate specialist health services.• She now attends a drop-in centre which has a crèche and where she is learning to cope with stress.• They have an open youth club with a drop-in disco once a week on a Friday night.• Desperate, his wife Irene chased up a radio advertisement for drop-in surgery performed with only a local anaesthetic.• Waiting time is reduce for patients and the drop-in system allows flexibility and encourages independence, maximising normality.• The drop-in system of battery connection is mainly used by Fisher and Compass. 