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1.
To execute without due process of law, especially to hang, as by a mob.
We were going to lynch Mr. Clyde because he didn't have a new shipment of potatoes last sundee.
by Lefty June 30, 2003
 
2.
1. When an angry mob publicly beats or executes an individual or small group of individuals who have not received fair representation under the law.

This is the original meaning of the word and was made popular by whites during the period of slavery in the Southern US.

The term is still used today by skinheads and the KKK.

2. To gain possession of an item, either rightfully or by stealing it.

1. KKK leader: Alright boys, let's go lynch some niggers!
2. Alex: Hey Bob, lynch me one of them cookies!
by Alex1010 April 12, 2009
 
3.
Any sort of extralegal justice that involves a mob killing someone in an unusually painful or public way
They lynched the big negro for no particular reason
by vince hamo September 24, 2003
 
4.
To get a mob to chase after a person and beat them, then proceed to tie them to a tree by the neck.
I'm pissed, let's go lynch some people.
by Arr Dee November 12, 2003
 
5.
when a large group of people attack a single person or a small group of people, usually innocent and unsuspecting, and beating him/them, sometimes to death, in a very violent and barbaric manner.
Lynch is a cowardly and disrespectful action, as the victim has no option of defending himself against the attackers, because they highly outnumber him.
As Jorge the Spanish-American was going home in the evening, a mob of Skin-Heads appeared from out of no-where, and started beating and stabbing him, then left him bleeding on the side-walk.

A long-lasting enmity between two gangs led to a lynch yesterday, when eight gang members lynched two members of another gang, beating them with baseball bats, killing one and causing the other serious injuries.
by Urban_Fellow September 26, 2007
 
6.
Managing to somehow fuck up things that are impossible to fuck up, like opening a door, pouring a glass of water, etc.
Bob: What'd you do to your hand?
Bill: I pulled a Lynch this morning trying to get a glass of water, I broke the glass and the sink...
by bronco 2 December 06, 2009
 
7.
lynch - a term used by the kkk, ( see kkk ), commonly consists of a severe beating, followed by the subject being roped or chained to hang from a tree by their neck.
white hooded and robed people lynching an african-american in USA, this was quite common in the southern parts.
by Within Temptation September 16, 2008