Thanks for using this online dictionary, we have been helping millions of people improve their use of the english language with its free online services. English definition of linchpin is as below...

Forelock :: Forelock (n.) A cotter or split pin, as in a slot in a bolt, to prevent retraction; a linchpin; a pin fastening the cap-square of a gun..

Pin :: Pin (n.) A linchpin.

Linchpin :: Linchpin (n.) A pin used to prevent the wheel of a vehicle from sliding off the axletree.

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