Definitions

1. noun

an unexpected and fortunate event or circumstance, especially one that brings financial gain

“The company’s sudden success was a windfall for its investors.”

2. noun

a quantity of something, especially money, that is received suddenly or unexpectedly

“The inheritance was a sizeable windfall for the young woman.”

3. verb

to gain something suddenly or unexpectedly

“The family’s fortunes changed when they won the lottery; they had finally windfall-ed their financial struggles.”