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Definition of Skeleton key
1. Noun. A passkey with much of the bit filed away so that it can open different locks.
Definition of Skeleton key
1. Noun. 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". ¹
2. Noun. A key that has parts filed away so that it will open a range of locks ¹
¹ Source: wiktionary.com