The expression "hit paydirt" means to achieve great success or to strike it rich. This phrase originated from the mining industry when a miner finally strikes a vein of valuable ore. There are several synonyms for "hit paydirt" that you can use in your everyday language. Some of these synonyms include "strike gold," "hit the jackpot," "come up trumps," "strike it lucky," and "hit the motherlode." These expressions are useful in conversation, especially when you want to describe a successful outcome, such as finding a great job or winning a big prize. Whatever term you use, when you hit paydirt, you know you've struck it rich!