This is the 2457th most frequent Polish word.
dna
The Polish word "dna" means "bottom" or "depths."
Here, 'dna' is used as the plural form of 'dno', meaning the bottoms (e.g., of bodies of water).
Dno jeziora było całkowicie pokryte wodorostami.
The bottom of the lake was completely covered with seaweed.
In this sentence, 'dna' indicates the surface at the lowest part of a physical location, demonstrating its spatial meaning.
Dotarliśmy do dna kanionu po długiej wędrówce.
We reached the bottom of the canyon after a long hike.
'Dna' here is used metaphorically, referring to the lowest point numerically or figuratively in a career.