Princeton's WordNet

1. waddle(verb)

   walking with short steps and the weight tilting from one foot to the other

   "ducks walk with a waddle"

2. toddle, coggle, totter, dodder, paddle, waddle(verb)

   walk unsteadily

   "small children toddle"

Kernerman English Learner's Dictionary

1. waddle(verb)ˈwɒd l

   to walk in a way that makes your body move from side to side

   a duck waddling toward the pond

Wiktionary

1. waddle(Noun)

   A swaying gait.

2. waddle(Verb)

   To walk with short steps, tilting the body from side to side.

Origin: First known use in English in a version of the Song of Roland around the year 1400. (Source:OED online)

Webster Dictionary

1. Waddle(verb)

   to walk with short steps, swaying the body from one side to the other, like a duck or very fat person; to move clumsily and totteringly along; to toddle; to stumble; as, a child waddles when he begins to walk; a goose waddles

2. Waddle(verb)

   to trample or tread down, as high grass, by walking through it

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