Linchpin Meaning

There are 2 meaning(s) for word Linchpin

Meaning 1 : pin inserted through an axletree to hold a wheel on

    Synonyms : lynchpin
Meaning 2 : a central cohesive source of support and stability

    Example : he is the linchpin of this firm

    Synonyms : anchor,  backbone,  keystone,  lynchpin,  mainstay