1
general::
Phrase(s): strike it rich
to acquire wealth suddenly. • If I could strike it rich, I wouldn’t have to work anymore. • Sally ordered a dozen oysters and found a huge pearl in one of them. She struck it rich!
McGrawhill's American Idioms And Phrasal Verbs
2
general::
Also, strike oil or strike it lucky. Experience sudden financial success, as in He never dreamed that he'd strike it rich this soon, or They really struck oil with that investment, or One of these days we'll strike it lucky. The first of these idioms originated in mining, where it referred to finding a rich mineral deposit. [Colloquial; second half of 1800s]
American Heritage Idioms