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• Murphy's Law
  Murphy's Law

  noun

  the facetious proposition that if something can go wrong, it will.
• Murphy's law
  Murphy's law

  noun

  another term for Sod's law

Murphy's Law

American  

noun

1. the facetious proposition that if something can go wrong, it will.

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Murphy's law British  

noun

1. informal another term for Sod's law

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Murphy's Law Cultural  

1. A rule that states, “If something can go wrong, it will.” An addition to this law reads, “and usually at the worst time.” The identity of “Murphy” is unknown, but the saying was first used during the 1940s and may have originated with members of the armed forces in World War II.

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Murphy's law Idioms  

1. If anything can go wrong, it will, as in We may think we've covered all the details for the benefit, but remember Murphy's law. The identity of Murphy, if ever a real person, is unknown. Some think it alludes to (but was not invented by) a feckless Irishman named Murphy. [c. 1940]

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Etymology

Origin of Murphy's Law

An Americanism dating to 1950–55; named after Edward A. Murphy, Jr., (1918–90), an American aerospace engineer who worked on safety systems

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Example Sentences

See Examples For:

Murphy's Law Murphy's law

Hilly’s Stage was also the scene of a powerful moment when D-Generation’s Jesse Malin, who is recovering from a spinal stroke, rose from his wheelchair and sang alongside Drescher and Murphy’s Law.

From Los Angeles Times ● Oct. 2, 2025

Byrne stars as Linda, a woman looking Murphy’s Law dead in the eye and screaming in its face.

From Salon ● Feb. 6, 2025

He was known for roles in the Thor film trilogy and the Divergent series, as well several UK TV shows like Band of Gold, Peak Practice and Murphy's Law.

From BBC ● May 22, 2023

Dr. Robinson remembered thinking of Murphy’s Law and joking, “I know exactly where it’s going to hit.”

From New York Times ● Jun. 27, 2022

And of course, Murphy’s Law, the year my mom started buying my clothes too big was the year that I stopped growing.

From "Born a Crime: Stories from a South African Childhood" by Trevor Noah

The county agreed to a $20 million settlement with Green’s family, which also was represented by Murphy’s law firm.

From Seattle Times ● Nov. 27, 2023

Nick Spark fell down a rabbit hole tracking down the origins of Murphy’s law, the ubiquitous phrase that says, “If it can go wrong, it will go wrong.”

From Slate ● Dec. 9, 2019

Murphy’s law for the digital age: anything that can go wrong, will go wrong during a live demonstration.

From Nature ● Nov. 4, 2019

But when Blue Jays closer Roberto Osuna blew a 95-mile-per-hour fastball past Judge for the final out, it capped a night that was largely a three-hour exercise in Murphy’s law.

From New York Times ● Jun. 2, 2017

In other words, it is a form of Murphy’s law: things always tend to go wrong!

From "A Brief History of Time: And Other Essays" by Stephen Hawking

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