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

1.
pranzo gratis, qualcosa di gratuito
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.
Non esiste un pranzo gratis; tutto ha un costo.
•
He thought he could get rich quickly, but he soon learned there's no free lunch.
Pensava di poter diventare ricco velocemente, ma presto imparò che non esiste un pranzo gratis.