So in that sense there's the potential for a knockout blow on March 4th.

NPR: Day of Reckoning Ahead for Clinton, Obama

The Romney campaign, looking to score a knockout blow, had devoted last-minute resources to Alabama and Mississippi.

WSJ: Santorum Wins Alabama, Mississippi Primaries

In a sign of their growing power, dads out to end the stereotype recently scored a knockout blow against a pair of TV ads.

CNN: June 15, 2012 -- Updated 1120 GMT (1920 HKT)

This is the case that may deliver a knockout blow to business method patents, those patents that everybody from free-software zealots to conservative Republicans love to hate.

FORBES: Bilski May Take Down Business Method Patents With Him

While the latest polling results and defections of leading jihadi ideologues admittedly are a major blow to al Qaeda, neither by any means constitutes a knockout punch.

CNN: Commentary: Al Qaeda isn't dead yet

With nothing else to play for, New Jersey would surely love to deliver the knockout blow to New York for the second year in a row.

WSJ: Devils eliminated from playoff race with loss