What is the meaning of the idiom No room to swing a cat?

The idiom “no room to swing a cat” means that a space or area is very small, cramped, or crowded. It suggests that the space is so limited that even attempting to swing a small cat (although no one would actually swing a cat) would be impossible due to lack of space.

In essence, when someone says there is “no room to swing a cat,” they are emphasizing how tight or restricted the space is, making it difficult to move around comfortably or to have enough space for any activity. It’s a humorous and exaggerated way to describe a very confined or cramped environment.