Good afternoon, I am trying to identify a 成语 that I came across in a textbook nearly 20 years ago (I unfortunately cannot remember the name of the book or its author, who was an American professor of Chinese). The English translation, if I remember correctly, was "to swim in boiling water and dance in fire". I cannot find the Chinese version in any of my dictionaries and my on-line searches have not helped either. Can anyone confirm the exact wording and meaning of this 成语? Thanks in advance.