Idiom
buck for something
Theme: ASPIRATION
to aim, try, or strike for a goal. (Originally referred to trying to get a higher military rank.)Bill acts that way because he's bucking for corporal.Tom is bucking for a larger office.
Slang
buck for something
Theme: WORK
tr. to work ambitiously for something, such as a promotion.I'm just bucking for recognition, and of course, a 20 percent raise.You can tell she's bucking for promotion.