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- Dictionaryskeleton key
noun
- 1. a key designed to fit many locks by having the interior of the bit hollowed.
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noun
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Key that has been filed or cut to create a master that can be used to unlock a variety of warded locks
A skeleton key is a type of master key in which the serrated edge has been removed in such a way that it can open numerous locks, most commonly the warded lock. The term derives from the fact that the key has been reduced to its essential parts. Wikipedia