make a killing
US /meɪk ə ˈkɪlɪŋ/
UK /meɪk ə ˈkɪlɪŋ/

1.
hacer una fortuna, hacer su agosto
to make a lot of money very quickly and easily
:
•
He made a killing in the stock market during the tech boom.
Él hizo una fortuna en el mercado de valores durante el auge tecnológico.
•
They're hoping to make a killing by selling their startup.
Esperan hacer una fortuna vendiendo su startup.