alligator wrench

alligator wrench

noun Machinery.
a wrench having a V -shaped pair of serrated jaws set at right angles to the shank for turning cylindrical or irregularly shaped parts.

Origin:
1935–40

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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WordNet
alligator wrench

noun
a wrench with a v-shaped jaw and serrations on one side (resembles the open jaws of an alligator) 
WordNet® 3.0, © 2006 by Princeton University.
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