This is the 240th most frequent Czech word.
síly
"Síly" in English means "forces" or "strengths" (plural form).
Here, 'síly' refers to 'strength' or 'energy', emphasizing a recovery after exertion.
Sbíral své síly po náročném dni.
He was gathering his strength after a tough day.
In this sentence, 'síly' is used metaphorically to indicate combining forces or resources for a common goal.
Spojili svoje síly na dokončení projektu.
They combined their efforts to finish the project.
Here, 'síly' refers to 'forces', specifically the elements or powers within nature.