Cliche of the Week 15 – Knife Edge

The government, the economy and almost any sports championship are all on a knife edge.

And the fabric of the world is so frail that water supplies in wetter climates wobble on the sharp side.

"Knife edge" appears in the mainstream media about 120 times a week. Add blogs and web news and it's more like 1400.

"Being free of living on a knife edge where any slip could cut you to pieces." (Former British PM Tony Blair in his memoirs, September 2)

"The water supply to the country's largest urban...