This is the 154th most frequent Azerbaijani word.
sizi
"You" (polite or plural form).
In this sentence, 'sizi' is the object of the verb 'tanıyıram' (I know), referring to the formal or plural second person.
Mən sizi çox yaxşı tanıyıram.
I know you very well.
Here, 'sizi' is part of the phrase indicating the person being apologized to, conveying respect or plural formality.
Sizi narahat etdiyim üçün üzr istəyirəm.
I'm sorry for disturbing you.
In this usage, 'sizi' is the object of the verb 'görmək' (to see), expressing a formal or plural 'you'.