v.1. To push or carry something inward by the force of moving air: Close the door; the wind is blowing in a lot of leaves. The breeze picked up a small feather and blew it in through the window.
2. To be pushed or carried inward by the force of moving air: I opened the screen and several flies blew in.
3. To cause something to collapse inwardly due to sudden powerful or violent force: The force of the explosion blew in the walls of the cave. The huge gust of wind came suddenly, blowing the windows in.
4. To collapse inwardly from sudden powerful or violent force: The holes that had been drilled in the oil field blew in during the fire.
5. To arrive unexpectedly: My old friend blew in from out of town today and paid me a visit.