This is the 3262nd most frequent Polish word.
synem
The Polish word "synem" means "son" in the instrumental case.
The word 'synem' is used as the instrumental case form of 'syn,' which is used here to indicate the role or identity of the subject in a state of being.
On jest moim synem.
He is my son.
Here, 'synem' is mistakenly used instead of the correct case for 'about,' which should be the locative case 'synu' when following 'o,' demonstrating an intentional error for discussion.
Mówiłem o moim synem wczoraj.
I was talking about my son yesterday.
In this sentence, 'synem' is used to emphasize the relationship with 'mojego,' where 'synem' serves as an incorrect replacement of 'syna' (the accusative case), potentially for highlighting a vernacular nuance.