This is the 15953rd most frequent Turkish word.
ustayı
"Ustayı" means "the master" or "the expert" in accusative case (indicating the object of a verb).
Here, 'ustayı' refers to 'the master' in the accusative case, indicating a direct object in the action of deciding to call someone.
Ustayı çağırmaya karar verdim.
I decided to call the master.
In this sentence, 'ustayı' is again in the accusative case, signifying the direct object of the verb 'watched.'
Tamir sırasında ustayı dikkatlice izledik.
During the repair, we watched the master carefully.
Here, 'ustayı' matches the accusative case to represent the direct object of the verb 'visit.'