Discussions about eggcorns and related topics
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Chris -- 2011-03-08
Looks to be an eggcorn squash of clinch, as in the clincher, and linchpin. You can see why “linchpin/lynchpin” might be shied away from in the first hit:
A linchpin is a pin through the axle to hold the wheel on a cart. It passed through a stage as a lins-pin, which means “axle-pin”, but was corrupted to “linch” through a fancied association with link, acc. to Skeat (1882). Clinch and cinch are better descriptors than link of what it does.