A commonly used modern phrase refers to Napoleon's final battle, in which the Duke of Wellington ended Napoleon's attempt to regain power in 1815. What is this phrase?

"Met his waterloo" - This means to finally meet one's ultimate obstacle and be defeated by that obstacle. This term was inspired from the Battle of Waterloo to describe how Napoleon was finally defeated by the Duke of Wellington. The term can be used as follows:

After defeating a number of opponents, the wrestler finally met his waterloo.