Wiktionary
take a bath
vb. 1 To bathe. 2 (context idiomatic English) To lose a large amount of money in an investment.
Usage examples of "take a bath".
Someone, probably Cloistress Gannet, had seen to it that she had everything she needed to take a bath.
Every morning after the stable doors are thrown open and the horses turned loose they invariably, of their own accord, proceed to the lake, wade out into shallow water and take a bath.
There isn't a man here who wouldn't pay quite a bit of money just for the chance to watch Sayuri take a bath.