linchpin ( synonym found)
Definition of linchpin:

°a pin inserted through holes at the end of an axle, so as to secure a wheel.
°a central cohesive source of stability and security; a person or thing that is critical to a system or organisation.
Definition of linchpin:

°a pin inserted through holes at the end of an axle, so as to secure a wheel.
°a central cohesive source of stability and security; a person or thing that is critical to a system or organisation.
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