sharp as a razor

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.
See also: razor, sharp
References in periodicals archive ?
In a nutshell: Sharp as a razor in tone and execution.
A jockey's life is difficult and stormy (with apologies to Rodgers & Hammerstein), and my admiration is for the man from Killarney, with a brain as sharp as a razor and a nerve as cool as the deep waters of Lough Leane, who propelled Best Mate into history on Thursday, March 18, 2004.