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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.
linchpin by Downstrike December 28, 2005
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lynchin' 

A form of population control that has been replaced by the drive by shooting.
Great granddad said in his county they were lucky if there was only 1 lynchin' a year. In my hood we're lucky if there is only 1 drive by a week.
lynchin' by yorkie stomper April 8, 2008

cyber-lynching 

The takedown of a person or peoples by a group of other people via social website. Usually involving ex-boyfriends, cheaters, liars and whores getting a bashing of their email inbox by the flood of hate they recieve. The equivalent of a lynching mob, but, unlike IRL, no physical damage is inflicted. Usually occurs on Facebook ('status wars') or Bebo.
WE TOTALLY GAVE LIAM A CYBER-LYNCHING!

Lunchpin 

The central person in a group of friends or co-workers whom decisions for going out to eat revolve around, and without whom no decision can be reached.
Paul is the lunchpin of our team -- if he doesn't choose what restaurant we're going to, we won't go anywhere.
Lunchpin by Thoren_NA April 13, 2010
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.
Linchpin by Xx_Lock&Key_xX January 6, 2021

Lynching 

A form of punishment involving the victim being forced to watch David Lynch movies as a movie marathon.
His movie tastes are so bad that next time he will get a good lynching.
Lynching by Psyckers October 4, 2018