"Free lunch"

Translation: Darmowy obiad

[NedSedgwic]

No such thing

[MarkKulka]

Podobno. Nie ma czegoś takiego jak darmowy obiad.

[JerryMcCarthy99]

"Bezpłatny" not accepted?

[Jellei]

Added it.

As well as "Obiad za darmo".

[Arlene117078]

Wolny obiad?

[alik1989]

Wolny is free, as in liberated, unchained.

[NeptalVera]

What about "Obiad gratis"?

[Okcydent]

Well, gratis in Polish usually means that the meal is free but only when you buy something in the first place (kind of tying agreement)

[maylas2000]

I'm not sure why, but this showed up as I was reviewing the colors part of the tree :/

[Jellei]

The Duolingo algorithm likes to put a random sentence into an unrelated skill from time to time.

[Lurven1]

Why not kolacja?

[Jellei]

Because "kolacja" is the evening meal, it's definitely not lunch.