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locker room
locker-room
Lockerbie
locket
lockfast
locking carabiner
lockjaw
lockkeeper
locknut
lockout
Lockport
lockram
locksmith
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loco (1)
loco (2)
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locknut

lock·nut [ lók nùt ] (plural lock·nuts)


noun 
Definition:
 
1. second nut tightened on first: a second nut tightened on a first to prevent it from loosening

2. self-locking nut: a nut designed to lock itself in place once tightened

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