From Longman Dictionary of Contemporary Englishroll in phrasal verb1 ARRIVEto happen or arrive in large numbers or quantities As the result of our appeal, the money came rolling in.2 ARRIVEto arrive, especially later than usual or expected Chris finally rolled in at about 4:00 am.3 DNif mist, clouds etc roll in, they begin to cover an area of the sky or land Fog rolled in from the sea. → roll→ See Verb table
Examples from the Corpus
roll in• Rebecca usually rolls in around noon.• Chris finally rolled in at about 4:00 am.From Longman Business Dictionaryroll in phrasal verb [intransitive]COMMERCEFINANCE if money or orders are rolling in, they are arriving in large quantitiesOrders are rolling in from all over Europe. → roll→ See Verb table 