beard the lion in his den—confront a person of power courageously on his own ground:
- Seeking to give Robbie’s father a piece of her mind she elects to beard the lion in his den—or rather his business office.
walk into the lion’s den—find oneself in a difficult situation in which one has to face unfriendly or aggressive people:
- After the failure of the negotiations, he had to walk into the lion’s den and face the Press.