This is the 1466th most frequent Polish word.
cię
"You" (direct object, singular).
The word "cię" is used here as the singular second-person pronoun in the accusative case, functioning as the direct object of the verb "zapytać" (to ask).
Czy mogę zapytać cię o radę?
Can I ask you for advice?
In this sentence, "cię" is the singular second-person pronoun in the accusative case, being the direct object of the verb "widzę" (I see).
Zawsze myślę o tobie, ale rzadko widzę cię.
I always think about you, but I rarely see you.
Here, "cię" is used in a colloquial context to imply absence, replacing the typical phrase "nie jesteś" (you are not).