To move unsteadily from side to side; to shake or rock back and forth without falling over; to be uncertain or wavering.
From Middle Low German 'wabbeln' (to waver), or possibly from Old Norse, related to the word 'wave,' used in English since around 1300.
A 'wobble' is technically different from a 'shake'—a wobble is side-to-side uneven movement, while a shake is back-and-forth—and this distinction matters in physics because wobbles can build energy and cause bridges to collapse if not designed for it.
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