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(as) sharp as a razor

1. Literally, having an extremely sharp point or edge. Be careful picking up those shards of broken glass! They're as sharp as razors. No one but Mommy or Daddy is allowed to use this carving knife, OK Tommy? It's sharp as a razor, and could take your whole finger off if you're not careful!
2. Very intelligent, witty, and quick-thinking. My grandmother's became very physically incapacitated as she grew older, but her mind was as sharp as a razor until the day she died. Of course Ellen is our valedictorian—she's sharp as a razor!
See also: razor, sharp

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.
See also: dance, edge, on

Occam's razor

A maxim that the simplest theory should be applied to a situation or experiment first. This concept is named for its ardent defender, 14th-century philosopher William of Occam. I think our initial hypothesis is too complex. Occam's razor would suggest we consider the simplest possible explanation.
See also: razor

on a razor's edge

With the possibility of failing or changing drastically very suddenly or at any given moment. The stability of the market is on a razor's edge, as banks struggle to deal with a huge number of failing mortgages and bad debts. The policy norms for the country tend to be on a razor's edge, as the majority in congress constantly shifts between the two major political parties.
See also: edge, on

on the razor's edge

To the point of doing 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 live on the razor's edge sometimes and go skydiving.
See also: edge, on

razor-sharp

1. Literally, very sharp, like a razor. Stand back, that tool is razor-sharp! Please be careful cutting those vegetables with such a razor-sharp knife.
2. Particularly clear, perceptive, and/or intelligent. Victoria may seem quiet, but she always has these razor-sharp insights on the texts we're reading. The think tank is known for razor-sharp analysis of world affairs. A lot of people are funny, but she has razor-sharp wit.

stepping razor

slang Someone who is dangerous and unlawful. Primarily heard in Jamaica. Don't mess with that group of stepping razors—they're dangerous. I heard that the police saw the victim running from a stepping razor and were able to apprehend him.
See also: razor, step
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.

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
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.

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.
See also: sharp, tack
The American Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 2003, 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

on a razor's edge

If a situation is on a razor's edge it could change or be decided at any time, often in a way that is dangerous. I knew my life at that moment hung on a razor's edge. In this election Ohio is balanced on a razor's edge between Republicans and Democrats.
See also: edge, on
Collins COBUILD Idioms Dictionary, 3rd ed. © HarperCollins Publishers 2012

Occam's razor

the principle that in explaining something no more assumptions should be made than are necessary.
This principle takes its name from the English philosopher and Franciscan friar William of Occam ( c .1285–1349 ): the image is that of the razor cutting away all extraneous assumptions.
See also: razor
Farlex Partner Idioms Dictionary © Farlex 2017

(as) sharp as a ˈtack

(American English) intelligent with a quick and lively mind: My grandmother’s 85 but she’s still sharp as tack.
A tack is a kind of small nail or pin.
See also: sharp, tack
Farlex Partner Idioms Dictionary © Farlex 2017

Occam's razor

The simplest explanation of something is apt to be the correct one. This principle is named for the English scholar William of Occam (or Ockham), who lived from 1280 to 1349. A Franciscan monk, he so angered Pope John XXII through both his writings on the nature of knowledge and his defense of his order’s vow of poverty that he was excommunicated. William, whom his colleagues called Doctor Singularis et Invincibilis (“singular and invincible doctor”), put his principle in Latin: Entia non sunt multiplicanda praeter necessitatem, “Entities should not be unnecessarily multiplied.” In effect, he held that any unnecessary parts of a subject being analyzed should be eliminated. Obviously, this could simply be called Occam’s Principle, and indeed, the razor did not enter into it until a French philosopher, Etienne Bonnot de Condillac, in 1746 called it Rasoir des Nominaux, “the razor of the nominalists,” that is, cutting through complicated arguments to reach the truth. In 1836 Sir William Hamilton, lecturing on metaphysics and logic, put the two ideas together, saying, “We are therefore entitled to apply Occam’s razor to this theory of causality.” While some may believe that this phrase, with its ancient and rather abstruse origin, is obsolete, novelist Archer Mayor clearly disagreed, for he entitled his 1999 murder mystery Occam’s Razor.
See also: razor

razor's edge, on the

In a critical or dangerous predicament. This analogy dates from Homer’s time (Iliad, ca. 850 b.c.): “To all it stands on a razor’s edge, either woeful ruin or life for the Achaeans.” W. Somerset Maugham used it as the title of a philosophical novel (The Razor’s Edge, 1944) exploring the meaning of life. Alan White used it in The Long Silence (1976): “He was living on a razor’s edge. Sooner or later, the Germans were going to begin to suspect.”
See also: on

sharp as a tack

Singularly keen or cutting; also, mentally acute. This simile has largely supplanted the earlier sharp as a razor, needle, vinegar, and thorn, the last dating from the fifteenth century and appearing in John Ray’s 1670 proverb collection. The current cliché dates from the late nineteenth or early twentieth century and appeared in a 1912 issue of Dialect Notes: “They won’t fool him; he’s sharp as tacks.”
See also: sharp, tack
The Dictionary of Clichés by Christine Ammer Copyright © 2013 by Christine Ammer
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Caption: Razors Share of 52 Week Promotional Support by Week
Baltimore, MD, January 21, 2016 --(PR.com)-- 800Razors, a fast-growing provider of razors, blades, shave cream, moisturizers and shaving accessories, today announced the launch of a new, expanded catalog of high-quality razors and shaving supplies for women.
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In back to back announcements made in March, the National Advertising Division (NAD) of the Council of Better Business Bureaus has recommended that Gillette modify certain claims for its Fusion ProGlide Razors and that co-razor maker Energizer Personal Care modify or discontinue certain advertising claims for the Schick Hydro razor.
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Wet razors are by far the most popular type of shaving system in the UK for men and women.