An example of a linchpin is an argument that connects evidence and effectively proofs a point.
Reduced spending is the linchpin of their economic program.
Origin of linchpin
- Middle English linspin lins linchpin (from Old English lynis) pin pin (from Old English pinn pin)
From American Heritage Dictionary of the English Language, 5th Edition
- Middle English lynspin, compound of lins 'axletree' and pin, from Old English lynis 'linchpin', from Proto-Germanic *luniso (compare German LÃ¼nse), from Proto-Indo-European (compare Welsh olwyn (“wheel"), Old Armenian Õ¸Õ²Õ¶ (oÅ‚n, “back; spine, backbone"), Sanskrit [script?] (Äá¹‡Ãs)). Figurative use attested from the mid-20th century.