skeleton key

American

noun

a key with nearly the whole substance of the bit filed away so that it may open various locks.

skeleton key British

noun

Also called: passkey. a key with the serrated edge filed down so that it can open numerous locks

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Etymology

Origin of skeleton key

First recorded in 1800–10

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

It’s why the conventional wisdom that air traffic controllers are the skeleton key to ending a government shutdown is so odd.

From Slate • Nov. 7, 2025

Those looking for a felt skeleton key to unlock his various idiosyncrasies aren’t likely to find one.

From New York Times • Mar. 11, 2023

The two hand-delivered the resolution to the city government in Novorossiysk along with a symbolic large golden skeleton key.

From Seattle Times • Mar. 18, 2022

The virus uses its spike protein like a skeleton key to ease open cells.

From Washington Post • Jun. 7, 2021

The charm looks like a miniature skeleton key like the one Shenice has for the trunk that belonged to her great-grandfather, who was apparently some big-deal baseball player.

From "Clean Getaway" by Nic Stone

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023