This is the 1480th most frequent Polish word.
kim
"Kim" in Polish means "whom" or "who" in instrumental case.
In this sentence, 'kim' is used to inquire about someone's role or relation to another person.
Kim dla Ciebie jest ona?
Who is she to you?
In this question, 'kim' functions as an interrogative pronoun asking about someone's identity.
Kim jesteś?
Who are you?
Here, 'kimś' is derived from 'kim,' used to signify an unspecified person in an aspirational context.