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skeleton key
The term describes a tool or concept that provides universal access. In its literal sense, it refers to a physical key with a simplified bit that bypasses the internal obstructions of various locks. This creates a connotation of stealth, mastery, or administrative authority over a physical space.
When used figuratively, the phrase shifts toward intellectual discovery. It suggests a singular, pivotal insight that makes a previously impenetrable subject suddenly clear. This usage is common in academic, investigative, or detective contexts where one specific clue resolves a larger puzzle.