The term WALK LIKE A DUCK can be summarized by the crossword solution WADDLE, which is a 6-letter word. Waddling is a type of walking that is associated with ducks and other waterfowl, as well as some other animals such as penguins. It is characterized by an up-and-down motion of the body, with the legs moving in a side-to-side motion. Waddling is used by these animals to move quickly and efficiently on land.