Sentence:  Whether tip-toeing daintily or skidding with controlled abandon across the space, Harold's softshoe dance ran the gamut of classic jazz dance steps. Circling <WSD>crossbacks</WSD> and crossovers, step-ball-changes, spin turns and grapevines, ... 
Meaning of the word marked with <WSD> tags:  A step in which one leg crosses behind the other.