locknut

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noun lock·nut \ˈläk-ˌnət\

Definition of locknut

  1. 1 :  a nut screwed down hard on another to prevent it from slacking back

  2. 2 :  a nut so constructed that it locks itself when screwed tight against another part

1855

First Known Use of locknut

1855

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the art of making engravings on wood

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