free lunch

US /friː lʌntʃ/
UK /friː lʌntʃ/
"free lunch" picture
1.

ただ飯, 無料のもの

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.
ただ飯というものはない。すべてには代償が伴う。
He thought he could get rich quickly, but he soon learned there's no free lunch.
彼はすぐに金持ちになれると思っていたが、すぐにただ飯はないことを学んだ。