This is the 324th most frequent Azerbaijani word.
işi
The Azerbaijani word "işi" means "work" or "job" (in the possessive form: "his/her/its work/job").
The word 'işi' is the possesive form of 'job/work', denoting 'his job'.
Onun işi çox mühümdür.
His job is very important.
Here 'işi' refers to 'this work/task', being the definite accusative form of 'iş'.
Mən bu işi tamamlamaq istəyirəm.
I want to finish this work.
In this case, 'işi' is used in the accusative case, indicating the direct object 'job' in the sentence.