To spend money lavishly; to squander a fortune in one go.
他对待朋友总是很大方，但偶尔也会千金一掷，请大家吃喝玩乐
He is always very generous with his friends, but occasionally he will squander a fortune in one go, treating everyone to food and entertainment.
Next Idiom
To spend money lavishly; to squander a fortune in one go.