I have started to read "The Sun Also Rises" by Ernest Hemingway. I stumbled a lot shortly after the beginning, as I'm a middle-aged Japanese dude who is struggling to learn English. I need someone's help.
The first problem is the meaning of the sentence “What a box to sweat in!”. It occurs in the dancing scene.
The context is as follows:
"It was hot and we came off the floor perspiring. “My God,” Georgette said. “What a box to sweat in!”".
I can guess why Georgette exclaimed that it was so hot. But what is "a box"? Is that the dancing room or the floor? What is "to sweat in"? What is the object of the "in"? Did they "sweat in a box"? I can't get the nuance.
Thank you in advance for your help. Any comments and/or corrections on my questions are also welcomed.