n. 25B6; verb it takes guts to buck the system : RESIST, oppose, defy, fight, kick against.
25A0; buck up (informal) CHEER UP, perk up, take heart, pick up, bounce back.
25A0; buck someone up (informal) CHEER UP, buoy up, ginger up, perk up, hearten, uplift, encourage, enliven, give someone a lift; informal pep up.