skeleton key
noun1
A very simple design of key that usually has a cylindrical shaft (sometimes called a "shank") and a single, minimal flat, rectangular tooth or "bit".
2
A key that has parts filed away so that it will open a range of locks.
3
A master key.
4
Figuratively A key (A crucial step or requirement) or (An idea, theory or observation that explains, justifies or renders (something) comprehensible).
- The skeleton key to this plan is the marketing, which will make the plan make sense when you see it.
- Related terms
- passkey