balancear

15:58 May 10, 2010 

If you put this question in the glossary, it should be balancearse, not balancear.

15:28 May 10, 2010 

"Wobble" would be the most frequent for common usage in U.S. English. If you want a more technical-sounding term, then maybe "oscillate".
oscillate Verbo Intransitivo «persona o cosa física»3 (quiver) oscilar , vibrar , balancearse , ondular , reciprocar
Other possibilities: Sinónimos: wobble, quiver , swing , bob , rock , vibrate , go back and forth , move in a wobbly manner , reciprocate , rock to and fro , swing to and fro , teeter , tremble , wave , balance, seesaw , undulate , vacillate. Have fun!

15:08 May 10, 2010 

You know I started with waver. But how does a knife waver? or swing? or wobble? Although wobble seems my best option so far.