Sentence:  The typical <WSD>bump and grind</WSD> of short-track racing at Bristol Motor Speedway met with the panicked push of the final races of the Nascar Nextel Cup. 
Meaning of the word marked with <WSD> tags:  A combination of movements resembling such a dance, as in road racing, whitewater kayaking, or exercising; any activity involving prolonged jarring or shaking.