linchpin
C1CEFR level
65/100Rarity: rare
TechnicalRegister
A person or element that is vital to holding an operation or team together.
The operations manager was the linchpin of the whole distribution network.
Rarity runs from 0 (a word everyone knows) to 100 (almost never seen outside specialist or literary writing). Level is the word's real difficulty on the CEFR scale, from A1 to C2.
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