lynchpin
制輪楔;輪轄
lynchpin
n 1: a central cohesive source of support and stability; "faith
is his anchor"; "the keystone of campaign reform was the
ban on soft money"; "he is the linchpin of this firm"
[syn: anchor, mainstay, keystone, backbone, linchpin]
2: pin inserted through an axletree to hold a wheel on [syn: linchpin]