safety nut

/ˌseɪfti nət/
IPA guide

Definitions of safety nut
  1. noun
    supplementary nut that is screwed down on a primary nut to prevent it from loosening
    synonyms: locknut
    see moresee less
    type of:
    nut
    a small (usually square or hexagonal) metal block with internal screw thread to be fitted onto a bolt
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