( informal )
1.
to arrive in great numbers or amounts :
Offers of help are still rolling in.
2.
to arrive late at a place, without seeming worried or sorry :
Steve rolled in around lunchtime.
ROLL IN
Meaning of ROLL IN in English
Oxford Advanced Learner's English Dictionary. Оксфордский английский словарь для изучающик язык на продвинутом уровне. 2005