It means you have a crow in your house.
An antonym is a word opposite in meaning to another, e.g. night - day, in - out, up - down. There is no antonym for chimney.
an umbrella
I don't get why, but it's an umbrella
A chimney.
What may go down the chimney up but not down the chimney down?
an umbrella
An umbrella
Smoke
an umbrella
An umbrella.
santa comes down the chimney