This is the 13973rd most frequent Turkish word.
menajerini
"Menajerini" means "your manager" in English.
Here 'menajerini' means 'his/her manager' as it refers to the possession by a third person and is an accusative form as it is the object of the verb 'arayıp' (calling).
Menajerini arayıp toplantının saatini değiştirmesini istedim.
I called his/her manager and asked them to change the meeting time.
In this sentence, 'menajerini' refers to 'his/her manager' and is used as an object of the verb 'seçerken' (choosing).
Oyuncu, menajerini seçerken çok dikkatli davranmalı.
The actor should be very careful when choosing his/her manager.
Here 'menajerini' refers to 'the team's manager' and is used as an accusative object in the context of changing by the team.