To spring with quick plunging leaps, descending with the fore legs rigid and the head held as low down as possible; said of a vicious horse or mule
mature male of various mammals (especially deer or antelope) United States author whose novels drew on her experiences as a missionary in China (1892-1973) jump vertically, with legs stiff and back arched; "the yung filly bucked"
To wash (clothes) in lye or suds, or, in later usage, by beating them on stones in running water
If someone has buck teeth, their upper front teeth stick forward out of their mouth