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Stillson wrench

[stil-suh n] /ˈstɪl sən/
noun, Trademark.
1.
a monkey wrench with a pivoted, adjustable jaw that grips pipes, bars, etc., more tightly when pressure is exerted on the handle.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for still son wrench

Stillson wrench

/ˈstɪlsən/
noun
1.
trademark a large wrench having adjustable jaws that tighten as the pressure on the handle is increased
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
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