Sentence:  After breakfast the men set out to hunt, while the women went to a large pool of warm water covered with a green scum and filled with billions of tadpoles. They <WSD>waded</WSD> in to where the water was about a foot deep and lay down in the mud. They remained there from one to two hours and then returned to the cliff. 
Meaning of the word marked with <WSD> tags:  to walk through water or something that impedes progress.