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

1.
공짜 점심, 공짜
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.
공짜 점심 같은 건 없어; 모든 것에는 대가가 따르지.
•
He thought he could get rich quickly, but he soon learned there's no free lunch.
그는 빨리 부자가 될 수 있다고 생각했지만, 곧 공짜 점심은 없다는 것을 깨달았다.