Meaning of the word "hit the jackpot" in English

What does "hit the jackpot" mean in English? Explore the meaning, pronunciation, and specific usage of this word with Lingoland.

hit the jackpot

US /hɪt ðə ˈdʒæk.pɑt/
UK /hɪt ðə ˈdʒæk.pɒt/

Idiom

to have a sudden and unexpected success, especially in making a lot of money

Example:
She really hit the jackpot when she invested in that startup.
He hit the jackpot with his new book, selling millions of copies.