1. (

• buck ,

) to strive with determination; "John is bucking for a promotion" ;

2. (

• buck ,
• go_against ,

) resist; "buck the trend" ;

3. (

• tear ,
• shoot ,
• shoot_down ,
• charge ,
• buck ,

) move quickly and violently; "The car tore down the street"; "He came charging into my office" ;

4. (

• buck ,
• jerk ,
• hitch ,

) jump vertically, with legs stiff and back arched; "the yung filly bucked" ;