waddle <a href='http://dictionary.cambridge.org/define.asp?dict=CALD&key=88749&ph=on' target='_blank' rel='nofollow'>http://dictionary.cambridge.org/define.asp?dict=CALD&key=88749&ph=on</a><br/>verb [I usually + adverb or preposition]<br/>(usually of a person or animal with short legs and a fat body) to walk with short steps, <b><i>swinging the body from one side to the other.</i></b><br/><br/>I can't understand the highlighed parts though I know the every word's meaning individually.<br/><br/>Could you explain it?