linchpin
noun
1 linchpin
A central cohesive source of support and stability:
— He is the linchpin of this firm.
synonyms: anchor, backbone, keystone, lynchpin, mainstay.
Dutch: middelpunt, sleutelfiguur, spil
Polish: ostoja
2 linchpin
Pin inserted through an axletree to hold a wheel on.
synonym: lynchpin.
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