This is the 342nd most frequent Czech word.
desítky
"Tens" (as in groups of ten or multiple tens).
Here, 'desítky' signifies an approximate quantity numbering in the tens.
Na náměstí se shromáždily desítky lidí.
Tens of people gathered in the square.
In this case, 'desítky' refers to the act of organizing or grouping items in quantities of tens.
Knihy ležely na stole v desítkách.
The books lay on the table in tens.
Again, 'desítky' is used to represent an approximate number, emphasizing devastation's scale.