[1] : The Collaborative International Dictionary of English v.0.48

wabble \wab"ble\ wo^b"b'l, v. i. cf. prov. g. wabbeln to
   wabble, and e. whap. cf. quaver.
   to move staggeringly or unsteadily from one side to the
   other; to vacillate; to move the manner of a rotating disk
   when the axis of rotation is inclined to that of the disk; --
   said of a turning or whirling body; as, a top wabbles; a buzz
   saw wabbles.
   1913 webster
see also:
quaver 

[2] : The Collaborative International Dictionary of English v.0.48

wabble \wab"ble\, n.
   a hobbling, unequal motion, as of a wheel unevenly hung; a
   staggering to and fro.
   1913 webster

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