hit it big
To find major or extraordinary success. My uncle earned a respectable living in the '90s selling computers, but he really hit it big when he got into software development.
hit it big
Score a major success, especially a profit, as in Some investors hit it big in the stock market. The adverb big here means "with great success." [Slang; late 1800s]
hit it big
Slang To be successful: investors who hit it big on the stock market.