A linchpin, also spelled linch pin, lynchpin, or lynch pin, is a fastener used to prevent a wheel or other part from sliding off the axle upon which it is riding. The word is first attested in the late fourteenth century and derives from Middle English elements meaning "axletree pin".

What does it mean to be called a linchpin?

English Language Learners Definition of linchpin

: a person or thing that holds something together : the most important part of a complex situation or system.

What does linchpin mean in the Bible?

(ˈlɪntʃˌpɪn ) noun. a pin that goes through the end of an axle outside the wheel to keep the wheel from coming off. anything serving to hold together the parts of a whole.