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  What it means

  Literally “wall concrete,” this colloquialism is used to describe something that is 100% certain, guaranteed, or “set in stone.” It suggests that a promise or a plan is as solid and indestructible as a concrete wall. You use it when you want to reassure someone that you will definitely show up or that a certain outcome is inevitable.

  Vocabulary

  • mur — wall (usually brick or stone)
  • beton — concrete
  • pewność — certainty
  • gwarancja — guarantee

  Grammar note

  This is an elliptical expression where two nouns are placed side-by-side to act as an intensifier. It functions as an adverbial phrase meaning "for sure."

  Cultural context

  This is informal but very common. It's the perfect phrase to use when you want to sound confident and decisive in a casual conversation.

  Intermediate

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