This is the 15812th most frequent Polish word.
słono
"Słono" means "salty" or "expensively" in English, depending on context.
In this sentence, 'słono' is used to indicate a high cost or expense, metaphorically referring to salt as a measure of value in historical contexts.
Za obiad w restauracji zapłaciłem słono.
I paid dearly for the dinner at the restaurant.
Here, 'słono' literally describes the heavy addition of salt, making the soup excessively salty.
Słono przyprawiłem zupę, teraz jest za bardzo słona.
I heavily seasoned the soup with salt, now it's too salty.
In this case, 'słono' figuratively describes a bitter or ironic expression, akin to preserving content as salt does.