History
History
History
UK
US
Meaning:

a bar passed through the end of an axle to keep the wheel in position; a person who keeps a business, organization etc successful

essence, theme

basic idea basis center core cornerstone criterion crux gist heart idea kernel linchpin mainspring marrow measure motive nub pith principle root source spring standard substance
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LINCHPIN as in Wiktionary
LINCHPIN as in Wikipedia