Meaning & use
Keystone
Last updated
The central wedge-shaped stone at the top of an arch that locks the other stones in place; figuratively, the essential element that holds a system together.
See it in a sentence
The mason carefully set the keystone at the apex of the bridge's arch.
Trust is the keystone of any strong relationship.
A note on using this word
Pennsylvania is nicknamed 'the Keystone State' for its central position among the original thirteen colonies.
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