This is the 419th most frequent Finnish word.
laskussa
"In the bill" or "falling/declining," depending on context.
In this sentence, 'laskussa' is used in the inessive case of the noun 'lasku', meaning 'in the bill'.
Laskussa on eritelty kaikki kulut.
The bill details all the expenses.
In this context, 'laskussa' metaphorically describes being in a downward trend or decline.
Hän on ollut laskussa viime aikoina terveydentilansa takia.
He has been on the decline lately due to his health condition.
Here, 'laskussa' indicates the location on the physical bill where something is written or printed.