Sentence:  In the stern of the low-laden canoe his paddle <WSD>swished</WSD> steadily and powerfully, with thrust of straight, stiff upper arm backed by a twisting swing of the body from the waist, and with every stroke the little craft leaped as if a giant hand had shoved her forward. 
Meaning of the word marked with <WSD> tags:  To make a rustling sound while moving.