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locknut

noun
lock·​nut | \ ˈläk-ˌnət How to pronounce locknut (audio) \

Definition of locknut

1 : a nut screwed down hard on another to prevent it from slacking back
2 : a nut so constructed that it locks itself when screwed tight against another part

First Known Use of locknut

1855, in the meaning defined at sense 1

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