The lion’s den
Definition 1 of 2
Pro Tip 1/3Metaphorical Use
Used figuratively to describe a risky situation, like facing strong opposition. 
Questioning the company's policy put him in the lion's den.
Pro Tip 2/3Cultural Origin
This phrase originates from the Biblical story of Daniel, who was thrown into a lion's den. 
Standing up to the bullies was like being in the lion's den.
Pro Tip 3/3Emotional Intensity
Often implies considerable stress or anxiety for the person involved. 
He felt he was walking into the lion's den when he went to address the hostile crowd.