This is the 2775th most frequent Polish word.
gotówką
"Gotówką" means "in cash."
The word 'gotówką' refers to 'in cash', indicating the mode of payment used.
Za obiad zapłaciłem gotówką.
I paid for the lunch in cash.
Here, 'gotówką' contrasts payment methods, highlighting it as a payment option.
W sklepie można płacić kartą lub gotówką.
At the store, one can pay with a card or in cash.
In this case, 'gotówką' describes the form of payment accepted.