This is the 10624th most frequent Polish word.
domiar
The Polish word "domiar" means "surcharge" or "additional amount."
'Domiar' is used here to denote an additional amount imposed, in this case as a surcharge.
Urzędnik nałożył domiar podatku za niezadeklarowane dochody.
The official imposed a tax surcharge for undeclared income.
In this sentence, 'domiar' is part of the phrase 'na domiar złego', which means 'to make matters worse'.
Na domiar złego, zaczęło padać podczas naszej wyprawy.
On top of that, it started to rain during our trip.
Here, 'domiar' refers to an extra or surplus amount of something, in this context profits.