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1.
Modern definition: Bling worn around the neck, often made of gold, silver, or platinum. Featured in a Jibbs song.

Traditional definition: Metal links that are locked together to make a strong and flexible line. Chains are typically used for anchors and other places where high loads may be exerted on the line, particularly in large vessels.
"Do your chain hang low
do it wobble to da flo
do it shine in n the light
is it platinum is it gold
could u throw it over ya shoulda
if ya hot it make ya cold
do your chain hang low"
-Jibbs
by Ducksoup October 01, 2006
 
2.
A rapper's source of power. The sunlight to his birdman. Without a chain of platinum/gold/diamonds/bones, a rapper sloses his ability to drop tight flows over phat beats. The is an absolute necessity, and its importance should not be taken lightly.
Ludacris once said, "Some people ask why there's a skull on my chain, it's 'cause I LOVE gettin' head."
by Don "Magic" Juan June 08, 2006
 
3.
A chain is a unit of length; it measures 66 feet. The chain in wildland firefighting is used as the measure of the rate of spread in chains per hour.

It is also used a lot by the USDA Forest Service by hand crews to see how far they have dug line or how far they have to go.
"How much farther are we going?"

"About 4 chains." (264 ft.)

"The wildland fire is spreading at 40 chains an hour." (2640 ft. or 1/2 a mile in 1 hour)
by Alistair MacIlherron September 24, 2009
 
4.
1: A chain worn around the neck, usually with a medallion of some sort. Typically made of gold, silver, or copper. Popular within the Hip-hop community.

2: A shortened version of "chain smoking".
Yo' I took that fool's chain last night, son.

Your dealer must chain like a motherfucker, bro.
by Porphyric August 12, 2009
 
5.
Refers to male genitalia.
Ryan was yanking Missie's crank on an adjustable photography machine and his pants got caught in the machinery! He checked his pants and his chain was okay.
by Definitely Not Michael January 13, 2011
 
6.
A garish necklace bestowed upon the brothers of Delta Upsilon at Middlebury College during the 1980's. Generally it was awarded to the person who had bedded the ugliest girl of the weekend and had to be prominently worn on Monday.
Did you see that pig Rob dragged upstairs last night? He will get the chain again!
by MidKid August 02, 2010
 
7.
Are absolutely intriguing and interesting.
Jenn: Phwee! +Hooks a chain to the collar-like choker she wears+
Jackie: Uh...
Kelsey: Jenn, people are going to think you're someone's bitch. A kinky someone.
Kate: Omfg. xD
Jenn: Eep. Oh well!
by Leiko October 06, 2004