Answer: bucker

AnswerCrossword Clue
buckera bucking horse
buckerrefuse assent balk
buckerbutt
buckerpass especially from one person to another
buckerperson employed to carry, shovel, lift, or load coal, farm produce, etc.
buckermove or react jerkily
buckermove or load (as heavy objects) especially with mechanical equipment
buckercharge against something (as an obstruction)
buckerperson who bucks rivets
buckercharge into (as a headwind)
buckerspring into the air with the back arched
buckerpose resist bucking the system
buckerhorse that bucks
bucker(in lumbering) a person who saws felled trees into shorter, more easily hauled lengths
buckerthrow (as a rider) by bucking
buckerstrive for advancement sometimes without regard to ethical behavior bucking for a promotion