1. Someone or something is facing imminent financial ruin or difficulty. Often used in plural constructions. The wolves have been at my door for so long that I don't really remember what it's like to not be on the verge of bankruptcy. As the economy continues to struggle, the wolf is at the door for many small businesses around the country.

2. Some danger, threat, or calamity imminent or at hand. Often used in plural constructions. Our nation is facing unprecedented threats from all over the world. The wolves are at our door, and we need to be prepared to confront them. I fear that when it comes to climate change, the wolf is already at the door.