Wiktionary
buck for
vb. (context idiomatic US colloquial English) To strive for persistently; to try hard to obtain (a promotion, raise, etc.).
Usage examples of "buck for".
I wondered numbly if he was capable of punishing all Buck for the lackluster way he had been welcomed to the throne.
By walking away she saved Buck for herself, as a memory of how it had been once.
Where she cannot find kin, she will command that notices be posted, informing that those related to the executed can come to Buck for compensation.
Well, they are nice kids and if we ever get out of this I'll be glad I'm single since I want to buck for a commission in the Amazons.