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swazzle

British  
/ ˈswɒzəl /

noun

  1. a small metal instrument held in the mouth of a Punch and Judy puppeteer, used to produce the characteristic shrill voice of Mr Punch

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Etymology

Origin of swazzle

C19: imitative of the sound produced