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A statement made to signify that what you speak is 100% the truth, the whole truth and nothing but the truth. Usually used when someone doesn't believe what you say, as it is bullshit, but this is used to try and make that person believe its true as its probably not.

What it actually means may derive from the old saying of "I swear on my mum's life!" which means absolutely nothing but some people think if that statement is said that they can't be lying.
"I swear down your honour, i didn't do it"

Nick: Did you know that Ahmed got arrested last night?
Keane: No he didn't.
Nick: Yeah man, swear down.
by GF November 30, 2006
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Apr 14 Word of the Day
That moment when you think a bug is crawling on you, and it turns out to be true. LMD

A FML moment. LMD

Pretty much you go, JUST LET ME DIE!

Wish this never happened. LMD
by misspinkyperfectionnnll July 09, 2011
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2
Expression used when you tell an unbelievable story that is in fact very true.
My little brother is addicted to violent violent games, swear down, I smashed his xbox in front of him.
by Billy-Soo October 07, 2019
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3
Similar to asking one to swear by something, this word is used in response to a statement that one suspects may not be true, or is very hard to believe.
"I just passed my driving test"

"You sweardown?"

"yes bruv!"
by zizu786 March 18, 2010
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4
A phrase used to imply that one is telling the truth.
That gash is bare buff yeah. She was all over me n tingz swear down.
by Alvin Monero February 07, 2008
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5
meaning that you are being very honest about something.
todd -"A' fuckin Swear Down right, shut the fuck up, ya doin ma head in."
by fresh prince of bellend April 14, 2009
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6
originating from chavs and pikeys in Ashford, UK.

Means to promise greatly to do something
i swear down I'm gona kill ya
by Ryk Turner January 22, 2005
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