a place just big enough to get the knees in
The Chinese idiom, R ó NGX ī zh ī D ì, means to describe the narrow room. It's from the song of returning home.
The origin of Idioms
In Tao Yuanming's Ci of returning home and coming home, it is said that "leaning on the south window to be proud, and judging the ease of the knee."
Idiom usage
Used as an object; used in writing.
Examples
Mr. Huang lives in a house with only ~, and can't entertain guests.
a place just big enough to get the knees in