dna

In a sentence

• Dno jeziora było całkowicie pokryte wodorostami.

  The bottom of the lake was completely covered with seaweed.

  Here, 'dna' is used as the plural form of 'dno', meaning the bottoms (e.g., of bodies of water).

• Dotarliśmy do dna kanionu po długiej wędrówce.

  We reached the bottom of the canyon after a long hike.

  In this sentence, 'dna' indicates the surface at the lowest part of a physical location, demonstrating its spatial meaning.

• Ten sportowiec osiągnął dno swojej kariery, ale się nie poddał.

  This athlete had reached the bottom of his career, but he did not give up.

  'Dna' here is used metaphorically, referring to the lowest point numerically or figuratively in a career.