A knock-down blow.    From Wordnet, Princeton University. 

Adjective : a knock-down-drag-out fight.    From Dictionary.com. 

"That does seem to be a knock-down argument, Tom.".    From Wordnik.com.  [The Citizen-Soldier or, Memoirs of a Volunteer] Reference

Give me a knock-down to the lady outside, will you?.    From Wordnik.com.  [Every Man for Himself] Reference

I just had a real knock-down drag-out fight with Dad.    From Wordnik.com.  [1968]

But she tried to do the whole drag-out knock-down thing.    From Wordnik.com.  [The Hard Way]

This conference will be a knock-down, drag-out battle royal.    From Wordnik.com.  [CNN Transcript Dec 23, 2009] Reference

It is knock-down, drag-out child custody battle with Britney.    From Wordnik.com.  [CNN Transcript Sep 21, 2007] Reference

The brand-new bloody, knock-down, drag-out Jon and Kate battle.    From Wordnik.com.  [CNN Transcript Jun 5, 2009] Reference

Says Sharry: "This is going to be a knock-down, drag-out campaign.".    From Wordnik.com.  [The Question Remains] Reference

We had a knock-down dragout, nearly a knock-down dragout the other day.    From Wordnik.com.  [CNN Transcript Feb 4, 2004] Reference

HARRIS: A knock-down drag-out between the Knickerbockers and the Nuggets.    From Wordnik.com.  [CNN Transcript Dec 18, 2006] Reference

Then they get into this knock-down, drag-out fight on their MySpace pages.    From Wordnik.com.  [CNN Transcript Aug 31, 2006] Reference

Tonight SHOWBIZ TONIGHT with the knock-down, drag-out Hollywood debate wars.    From Wordnik.com.  [CNN Transcript Oct 7, 2008] Reference

Ruin Dr Khan and he'd have to sell it to you and your wife at a knock-down price.    From Wordnik.com.  [Rumpole and the Reign of Terror]

Michael Joseph Gross scores a ringside exclusive to the knock-down, drag-out divorce.    From Wordnik.com.  [February 2008] Reference

CROWLEY: It was not the knock-down drag out that so many predicted but it was pointed.    From Wordnik.com.  [CNN Transcript Oct 31, 2007] Reference

There's going to be a lot of knock-down, drag-out fights over these nominations -- Lou.    From Wordnik.com.  [CNN Transcript Jun 6, 2005] Reference

To the other consul it was a real knock-down blow, and he is, I assure you, a ruined man.    From Wordnik.com.  [The Letters of Cicero, Volume 1 The Whole Extant Correspodence in Chronological Order] Reference

Behind all her knock-down, drag - out tabloid headlines, she, too, has fought depression.    From Wordnik.com.  [CNN Transcript Apr 21, 2005] Reference

Dignity characterized him, whether in the "knock-down" and "drag-out" caucus or at an exclusive.    From Wordnik.com.  [The United States Since the Civil War] Reference

One night we were invited out for dinner, and we got into a knock-down, drag-out that afternoon.    From Wordnik.com.  [A Little Peace] Reference

The mom and stepmom of the little girl in "Slumdog Millionaire" in a knock-down, drag-out brawl.    From Wordnik.com.  [CNN Transcript Apr 22, 2009] Reference

Coming up, a knock-down, drag-out argument about immigration with the unthinkable on this issue.    From Wordnik.com.  [CNN Transcript Jun 8, 2008] Reference

HARRIS: A knock-down drag-out between the Knicks and Nuggets -- punches thrown like free throws.    From Wordnik.com.  [CNN Transcript Dec 18, 2006] Reference

Two guys there throwing down -- knock-down, drag-out fight across five lanes of rush hour traffic.    From Wordnik.com.  [CNN Transcript Nov 14, 2007] Reference

And as Dave floundered, hopelessly puzzled, he added: "Give me a knock-down, man, don't you savvy?".    From Wordnik.com.  [The Furnace of Gold] Reference

Private landlords who buy to rent do not allow their tenants to purchase the property at knock-down prices.    From Wordnik.com.  [Can David Cameron match Harold Macmillan's achievement in house-building?] Reference

It is used in work-benches and in ornamental joints like knock-down bookcases and in other mission furniture.    From Wordnik.com.  [Handwork in Wood] Reference

The fight over whether I could go was a major knock-down, drag-out teenage power play with my parents, and I lost.    From Wordnik.com.  [Ellis Weiner: Happy-ish New Year] Reference

Despite all of my good intentions, I still have had some knock-down, drag-out fights with both friends and ex-boys.    From Wordnik.com.  [Meredith Fineman: Fifty First (J)Dates: I Can't Stand You, But You Might Be Great for Melissa.] Reference

To employ an expression of M. Nadar's it seems that these gentlemen never before experienced such a "knock-down blow.".    From Wordnik.com.  [Wonderful Balloon Ascents] Reference

And knock-down, drag-out fights, nastiness, but you really kind of do see what she sees in him, and it's kind of sweet.    From Wordnik.com.  [Oafs, Cheaters And Jerks: Film's Worst Boyfriends] Reference

Because a fellow gets a single knock-down in a fight ought he to throw up the sponge right away, and own himself beaten?.    From Wordnik.com.  [The Chums of Scranton High on the Cinder Path] Reference

Sure, they might score from a set-piece or a Davies knock-down, but in open play there's very little poise or creativity.    From Wordnik.com.  [Bolton Wanderers v Birmingham City - as it happened] Reference

We felt like a boxer who, after a knock-down blow, rises at the count of nine, say, and is at once sent down again for good.    From Wordnik.com.  [With Our Army in Palestine] Reference

I would be ashamed to use the knock-down and drag-out language; that is not the language of liberty, that is the language of braggadocio.    From Wordnik.com.  [Woodrow Wilson as I Know Him] Reference

Tuscany, dealing a knock-down blow to the "despotism" of Austria, and spitting her eagle on a bayonet; altogether justifying his reputation.    From Wordnik.com.  [The History of "Punch"] Reference