linchpin

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.

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linchpin

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

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Linchpin

1. The person in a group of friends who keeps them together, is forgotten about, but once leaves, things fall apart.
2. The person in a group who is irreplaceable and once is lost, things go to shit.
3. The thing that can link multiple groups together, but once is removed; things fall apart like a house of cards.
4. That one person in the group who was quiet, was picked on by all but put up with it. The underappreciated friend and person who was always there. But once was removed... the great Friends-War starts.

We got to be nicer to Bob. He's done a lot for us. After all, he's our linchpin. As annoying as he may be sometimes.
Thanks to Josh, we know Kyle's group of friends. But, the only reason why we hang out with them is because of Josh. Linchpin holds the wheel together.