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alligator clip

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noun Electricity.
  1. a type of terminal for making temporary electrical connections, consisting of a cliplike device with long, narrow jaws that resemble those of an alligator.
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Origin of alligator clip

First recorded in 1940–45
Also called alligator clamp.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018