He lived on a knife-edge between genius and insanity.    From Wordnet, Princeton University. 

England warns that the event is on a "knife-edge.".    From Wordnik.com.  [Next time, Braylon Edwards should just dial] Reference

Most knife-edge doomwatch since the Cuban Missile.    From Wordnik.com.  [Gordon Brown, Charlie Whelan and Me] Reference

"The banking industry is on a knife-edge," he said.    From Wordnik.com.  [ANC Daily News Briefing] Reference

He wore the correct clothes, with a knife-edge crease.    From Wordnik.com.  [The 13 Culprits]

At no point were the elections ever on a "knife-edge".    From Wordnik.com.  [ANC Today] Reference

Live on a knife-edge, waiting for the figurative axe to fall?.    From Wordnik.com.  [Purchased By The Billionaire]

It all seemed to balance on the knife-edge of mood and temper.    From Wordnik.com.  [Maid in Waiting] Reference

I'm walking a knife-edge, with disastrous falls on either side.    From Wordnik.com.  [St. Peter's Fair]

"Bafana dream on knife-edge: Uruguay victory leaves nation praying".    From Wordnik.com.  [Thursday World Cup kickaround] Reference

It holds a vertical spindle with the knife-edge wheel at the bottom.    From Wordnik.com.  [Encyclopaedia Britannica, 11th Edition, Volume 4, Part 4 "Bulgaria" to "Calgary"] Reference

"I think we'll be sitting on a knife-edge for a bit longer," he says.    From Wordnik.com.  [Row Over Riches] Reference

The ANC is poised on a knife-edge that requires a fine balancing act.    From Wordnik.com.  [ANC Daily News Briefing] Reference

"I think we’ll be sitting on a knife-edge for a bit longer," he says.    From Wordnik.com.  [Australia's Miners Hopeful Tax Will Be Dropped] Reference

The plane of the knife-edge wheel r is therefore always parallel to DB.    From Wordnik.com.  [Encyclopaedia Britannica, 11th Edition, Volume 4, Part 4 "Bulgaria" to "Calgary"] Reference

After time, the knife-edge of the pain gets dull, but it's always with you.    From Wordnik.com.  [CNN Transcript Aug 1, 2002] Reference

Labour and SNP are on a knife-edge with 100,000 supposedly spoiled ballots.    From Wordnik.com.  [Respectable not sensational] Reference

He didn't realize that our lives had been balanced on a knife-edge of danger.    From Wordnik.com.  [The Rainbow and the Rose]

Her offered, her passive extent, in other words, was about that of a knife-edge.    From Wordnik.com.  [The Portrait of a Lady] Reference

Women candidates walk a knife-edge between appropriate and inappropriate behavior.    From Wordnik.com.  [Caryl Rivers: The Gender Rules] Reference

Its knife-edge brilliance met a cliff of stone and seemed to simply slip through it.    From Wordnik.com.  [Tides Of Light]

German silver wire, N, is traversed by two movable knife-edge contacts, cc, as shown.    From Wordnik.com.  [Scientific American Supplement, No. 430, March 29, 1884] Reference

At the top of the stick of graphite is a metal cap carrying a knife-edge, on which rests.    From Wordnik.com.  [Scientific American Supplement, No. 458, October 11, 1884] Reference

This division over direction in international climate policy is resting on a knife-edge.    From Wordnik.com.  [Alex Rafalowicz: Update from Bonn: The Crazy Killing of the Kyoto Protocol] Reference

This week those knife-edge putts stayed out of the hole, and that was all the difference.    From Wordnik.com.  [How Yang Caught a Tiger] Reference

He wears black clothes, pants creased to a knife-edge, loose shirts with mandarin collars.    From Wordnik.com.  [Can Christoph Eschenbach and the National Symphony Orchestra give each other a fresh start?] Reference

For the first time since 1955, the vote in Scotland genuinely seems to be on a knife-edge.    From Wordnik.com.  [Has Brown saved the union?] Reference

Without police co-operation, some of the charges remained "on a knife-edge," said the City Press.    From Wordnik.com.  [ANC Daily News Briefing] Reference

Two types, the point and knife-edge respectively, are shown in Fig. 168 and the top part of Fig. 172.    From Wordnik.com.  [Things To Make] Reference

In our illustrations, C is a knife-edge rail, upon which run grooved wheels supporting the pugging box.    From Wordnik.com.  [Scientific American Supplement, No. 315, January 14, 1882] Reference

As it approached, the tentacle withdrew, and in its place appeared a jointed metal arm ending in a knife-edge.    From Wordnik.com.  [The Status Civilization] Reference

And not only has the essential choice now become clear, but all the signs are that the result is on a knife-edge.    From Wordnik.com.  [Ed is the only Miliband who offers a genuine alternative] Reference

The pulsing, steady-state equation of the universe maintained its knife-edge and inevitable thermo-dynamic balance.    From Wordnik.com.  [General Max Shorter] Reference

Rodriguez showed off his knife-edge tailoring with crisp charcoal gray sheaths softened with insets of pale pink satin.    From Wordnik.com.  [Fashion Week wrap-up: Fresh talent has clearly joined the ranks of the old guard] Reference

I stooped over her in the dark of Collins's tunnel, where just a knife-edge of the cave firelight cut over the boulder's top.    From Wordnik.com.  [The La Chance Mine Mystery] Reference

The North is rising — there, lie still, man — there will be sahibs enough for your knife-edge, when your wound is healed.    From Wordnik.com.  [Flashman In The Great Game]

The great woods thinned out and the way they followed took an upward swing, whilst a steady wind with the knife-edge cold of the.    From Wordnik.com.  [A Mating in the Wilds] Reference

When he got to the cothold, Master Zist had just put down his sharpening stone, and the new knife-edge glistened in the sunlight.    From Wordnik.com.  [Dragon's Kin]

After three faultless somersaults, he released his legs and untwisted his body into knife-edge form before disappearing into the hole.    From Wordnik.com.  [The Hole Between Them] Reference