work (clay) into a soft, plastic condition suitable for making bricks or pottery, without air pockets

clay that has been more consistently pugged will have a finer, denser body

pack (a space) with pug, sawdust, or other material in order to deaden sound or make something fireproof

if the ducts have to take direct routes then they must be pugged with material similar in density to the partition

track (an animal) by its footprints