lynchpin

Noun
  1. A central cohesive source of support and stability (synset 105702197)
    "faith is his anchor"; "the keystone of campaign reform was the ban on soft money"; "he is the linchpin of this firm"
    is a type of: support - something providing immaterial assistance to a person or cause or interest
    same as: anchor, backbone, keystone, linchpin, mainstay
  2. Pin inserted through an axletree to hold a wheel on (synset 103675665)
    is a type of: pin - a small slender (often pointed) piece of wood or metal used to support or fasten or attach things
    same as: linchpin

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