This is the 987th most frequent Slovak word.
krku
"Krku" is the genitive or dative singular form of "krk," meaning "neck" or "throat" in English.
Here, 'krku' refers to the throat in a physical health context.
Bolesť v krku je nepríjemná.
A sore throat is unpleasant.
In this sentence, 'krku' stands for the neck, used figuratively to describe the part of the body where the scarf is worn.
Nosil šál okolo krku, aby sa zahrial.
He wore a scarf around his neck to keep warm.
This usage of 'krku' is idiomatic, indicating being overwhelmed or tired of a situation.