Breakdown of nerai o kimeru.

Questions & Answers about nerai o kimeru.
It is pronounced ねらい を きめる.
- 狙い = ねらい
- を = pronounced o
- 決める = きめる
So the full phrase is nerai o kimeru.
を marks the direct object of the verb.
Here:
- 狙い = the thing being decided
- 決める = to decide / determine
So 狙いを決める literally means decide the aim/target.
A native English speaker may expect something like decide on, but in Japanese the thing decided is often marked directly with を.