Wabble

verb & noun

noun

1. A rocking, unequal motion, as of a wheel unevenly hung or a top imperfectly balanced.
2. An old name of the great auk, Alca impennis. Josselyn, New England Rarities Discovered.
3. To incline to the one side and to the other alternately, as a wheel, top, spindle, or other rotating body when not properly balanced; move in the manner of a rotating disk when its plane vibrates from side to side; rock; vacillate.
4. Hence To vacillate, vibrate, tremble, or exhibit unevenness, in senses other than mechanical.