Stillson wrench

[stil-suh n]
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  1. a monkey wrench with a pivoted, adjustable jaw that grips pipes, bars, etc., more tightly when pressure is exerted on the handle. Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for stillson wrench

Stillson wrench

  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