
Keystone
Arch Stability
The word emphasizes the importance of the central stone in maintaining an arch's integrity.

The old bridge's keystone has eroded, threatening the entire structure.
Symbol of Strength
In literature and speeches, 'keystone' may symbolize vital support or strong foundation.

He is the keystone of our community, keeping us united.
Compare with
AnchorCapstoneCornerstoneLinchpinMainstayNucleus
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