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Murphy's law

noun [U]
 
 
/ˌmɜː.fizˈlɔː/ US  /ˌmɝː.fizˈlɑː/ (UK offensive also Sod's law) humorous

Definition

the principle that if it is possible for something to go wrong, it will go wrong: The bus is always late but today when I was late it came on time - that's Murphy's law I suppose!Good luck and bad luck
(Definition of Murphy's law noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

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