The phrase "not enough room to swing a cat", means the space/room is small and usually awkwardly so.
It's often thought to refer to the "cat o' nine tails", slang for a type of whip once used in the navy. However there is some doubt about this origin.
If you have a question about the English language and would like to ask one of our many English teachers and language experts, please click the button below to let us know: