Sentence:  Or when the wind, a-springen keen Vrom eastern slopes, did fling about The snow, or overlay the tree An' ground wi' hoar-vrost grey, Sis, sis, our <WSD>litty</WSD> steps did sound, A-trippen on the vrosty ground. 
Meaning of the word marked with <WSD> tags:  Lively and nimble.