Strike it rich
Definition 1 of 1
Pro Tip 1/3Sudden Wealth
This phrase suggests a quick and unexpected gain, not a slow build-up of success. 
She bought a lottery ticket on a whim and struck it rich overnight.
Pro Tip 2/3Luck Factor
Luck plays a big role when using this phrase; it's not usually about careful planning. 
I never expected to find a rare coin in the attic and strike it rich!
Pro Tip 3/3Occasional Use
The phrase is not commonly used in daily conversation but is popular in stories and news. 
When the prospector struck it rich, the news spread through town like wildfire.