This is the 10044th most frequent Turkish word.
baldızım
"My sister-in-law" (specifically, wife's sister).
Here, 'baldızım' is used to refer to the speaker's sister-in-law (wife's sister), indicating possession with the suffix '-ım'.
Baldızım, ailemizi ziyarete geldi.
My sister-in-law came to visit our family.
'Baldızım' still means sister-in-law but here it's in the subject.
Baldızımla alışveriş merkezine gittik.
I went to the shopping mall with my sister-in-law.
The word 'baldızım' indicates possession and is further modified as 'baldızımın' to mark the possessive-genitive relationship for the noun following it.