From Longman Dictionary of Contemporary Englishstop in phrasal verb informal1 GOto make a short visit to a place or person, especially while you are going somewhere else I’ll stop in and see you on my way home. at I need to stop in at the library.2 British EnglishSTAY/NOT LEAVE to stay at home I’m stopping in to wash my hair tonight. → stop→ See Verb table
Examples from the Corpus
stop at• By late afternoon we'd stopped in at a number of bars along the pier.• He chose a holiday, one on which many families sightseeing in Jerusalem stop in at one of the inexpensive downtown restaurants.• I need to stop in at the office for a minute.• He never stopped in at the Susweca for refreshment after he was finished for the day. 