Sentence:  'Twas early June, the new grass was flourishing everywheres, the posies in the yard—peonies and such—in full bloom, the sun was shining, and the water of the bay was blue, with light green <WSD>streaks</WSD> where the shoal showed. 
Meaning of the word marked with <WSD> tags:  An irregular line left from smearing or motion.