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1. Literally; n., a pin or keeper, placed through or around an axle, that prevents a wheel from slipping off of its axle.

2. Slang; n., Any part or person that is so vital to something that if it went missing, the whole thing would fall apart.
1. You have to pull the linchpin to adjust the bearings.

2. Someone has to take the snap, so the quarterback is the football offensive team's linchpin.
by Downstrike November 27, 2005
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linchpin - the faggot of the group who thinks he is important.
caleb - guys admit it i am the linchpin of our group

group - yea caleb you are a queer go jump off a bridge
by fuckoffcaleb February 17, 2014
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