buck off(redirected from buck him off)
Of a horse, to stand on its back legs, in an attempt to knock a rider off its back. The rider can be mentioned between "buck" and "off" or after "off." Be careful with that horse—he's pretty ornery and might try to buck you off.
buck someone off
[for a horse or similar animal] to rear up in an attempt to shake off its rider. The horse tried to buck Sharon off, but she held on tight. The horse bucked off its rider.