Correct Answer: To experience defeat

Solution : The correct option is the second option.

Explanation: The idiom "to meet one's Waterloo" is derived from the historical event of Napoleon Bonaparte's defeat at the Battle of Waterloo. Therefore, the figurative meaning of the idiom is to face a significant and final defeat or failure in a particular endeavour. This choice aligns with the historical context and reflects the idiomatic usage of "waterloo" to signify a decisive and often overwhelming defeat.

Therefore, the correct meaning of the idiom is, to experience defeat.