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Definition of linchpin:

  1. A pin used to prevent the wheel of a vehicle from sliding off the axletree.

Synonyms:

keystone, mainstay, spinal column, pillar, anchor, gumption, anchorman, rachis, guts, anchorperson, sand, grit, headstone, back, vertebral column, backbone, lynchpin, ground tackle, spine, moxie, key.

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