1. [n]  causing to move repeatedly from side to side
2. [v]  move unsteadily or with a weaving or rolling motion
3. [v]  move from side to side, as of fingers and tails; "The happy dog wagged his tail"

Waggle
A young girl finds a new friend when her father brings home an enthusiastic and very waggly young puppy. Colorful collage illustrations accompany the text.

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1. \Wag"gle\, n.
   A waggling or wagging; specif. (Golf), the preliminary
   swinging of the club head back and forth over the ball in the
   line of the proposed stroke.
   

2. \Wag"gle\, v. i. [Freq. of wag; cf. D. waggelen, G.
   wackeln.]
   To reel, sway, or move from side to side; to move with a
   wagging motion; to waddle.
         Why do you go nodding and waggling so?   --L'Estrange.
   

3. \Wag"gle\, v. t. [imp. & p. p. {Waggled}; p. pr. & vb. n.
   {Waggling}.]
   To move frequently one way and the other; to wag; as, a bird
   waggles his tail.