The dilapidated apartment was a real rattrap, with peeling wallpaper and creaky floors.

rattrap 由 rat（老鼠）和 trap（陷阱）组成，字面意思是"捕鼠器"。 在俚语中，rattrap 常用来形容肮脏破旧的住所，比喻像老鼠窝一样糟糕的环境。