lock-nut

n extra nut screwed over another to prevent it becoming loose 防松螺母.

local colour, local government, local option, local time, locale, locality, localization, localisation, localize, localize, localise, locally, locate, located, location, loch, loci, lock, lock oneself in, lock out, lock-gate, lock-keeper, lock-out, lock-stitch, lock-up, lockable, locker, locker-room, locket, lockjaw, lockout, locksmith, loco, locomotion, locomotive, locum, locus, locus classicus, locust, locution, lode, lodestar (also loadstar),