Get away with murder is an English

idiom An idiom is a phrase or expression that largely or exclusively carries a Literal and figurative language, figurative or non-literal meaning (linguistic), meaning, rather than making any literal sense. Categorized as formulaic speech, formulaic ...

, used to describe escaping the consequences of an action. While literally it refers to someone committing a murder and not being punished, it can be used figuratively of someone who is seen not to suffer the consequences of their actions: "I hate to see a mother who lets her children get away with murder". It's unknown where and when the idiom originated from exactly, but is theorized to be from the

United Kingdom The United Kingdom of Great Britain and Northern Ireland, commonly known as the United Kingdom (UK) or Britain, is a country in Northwestern Europe, off the coast of European mainland, the continental mainland. It comprises England, Scotlan ...

sometime between

1200 The Proleptic Gregorian calendar called it a century leap year. Events By place Europe * Spring – Boniface I, Marquis of Montferrat, sends envoys to Venice, Genoa and other city-states to negotiate a contract for transport to t ...

and

1500 Year 1500 ( MD) was a leap year starting on Wednesday in the Julian calendar. The year 1500 was not a leap year in the proleptic Gregorian calendar. The year 1500 was the last year of the 15th century and the first year of the 16th century. ...

References

English-language idioms {{vocab-stub