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Related to razor: Razor burn
dance on the razor's edge
To do something risky or dangerous. Please, you just like him because he's the bad boy who dances on the razor's edge with his motorcycle! I like to dance on the razor's edge sometimes and do things like skydive and bungee jump.
sharp as a razor
1. very sharp. (*Also: as ~.) The penknife is sharp as a razor. The carving knife will have to be as sharp as a razor to cut through this gristle.
2. and sharp as a tack very sharp-witted or intelligent. (*Also: as ~.) The old man's senile, but his wife is as sharp as a razor. Sue configure things out from even the slightest hint. She's as sharp as a tack.
(as) sharp as a tack
very intelligent He may be old in years, but he's still as sharp as a tack and knows what he's talking about.
sharp as a tack
Also, sharp as a razor. Mentally acute. For example, She's very witty-she's sharp as a tack. These similes are also used literally to mean "having a keen cutting edge" and have largely replaced the earlier sharp as a needle or thorn. The first dates from about 1900, the variant from the mid-1800s.