ˈ ̷ ̷ˌ ̷ ̷ noun
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 up tight
3. : a nut screwed against the end of a pipe fitting to hold it securely and prevent leakage
4. : a nut used with an electrical conduit for locking it into a junction box or fitting