free lunch
US /friː lʌntʃ/
UK /friː lʌntʃ/

1.
almuerzo gratis, algo gratis
something that is obtained without effort or cost, often implying that such a thing is rare or nonexistent
:
•
There's no such thing as a free lunch; everything has a cost.
No existe el almuerzo gratis; todo tiene un costo.
•
He thought he could get rich quickly, but he soon learned there's no free lunch.
Pensó que podría hacerse rico rápidamente, pero pronto aprendió que no hay almuerzo gratis.