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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
Related Words
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
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
linchpin by fuckoffcaleb February 19, 2014

linkshaming 

Shaming someone for posting obnoxiously long links
Carol: url: naw.facebook.org/fsdlksfjejsej90seij/COINS_tptptpsieisis/DALLAS_$@%/ttitosliensieoslen223232/vacationpics.jpg
Brent: What the fuck carol that's a hideously link
Carol: please stop linkshaming me, im 87 years old
linkshaming by Fantasia Butuka July 10, 2019

Linachiin 

a yummy delicious dessert made out of honey and dark chocolate on an instantaneous hugs degree, Linachiin can be served hot or cold at anytime of the day. It's recommended to eat it without any adds or else it wouldn't be a Linachiin.
Person 1 : won't you ever eat already ?!
Person 2 : no, a had Linachiin in about a year so basically it would be enough to me for a lifetime.
Linachiin by Winter Hat November 22, 2021

linchkin 

a nickname for someone who means a lot to you.
You: Hi linchkin
Them: Linchkin?
You: Im sayin you mean a lot to me
linchkin by _sliderdan November 24, 2023