This is the 8462nd most frequent Turkish word.
ozman
It seems you may mean "uzman." In English, it translates to "expert."
In this sentence, 'o zaman' is used as 'then,' indicating a specific time in the future.
O zaman görüşürüz.
See you then.
Here, 'o zaman' shows a conditional result, linking the cause and its consequence.
Ders çalışmazsan o zaman zorlanırsın.
If you don’t study, then you will struggle.
'O zaman' in this context refers back to a mentioned time or occasion in the past.