unwritten law

noun
1.
a law that rests for its authority on custom, judicial decision, etc., as distinguished from law originating in written command, statute, or decree.
2.
the unwritten law, the supposed principle of the right of the individual to avenge wrongs against personal or family honor, especially in cases involving relations between the sexes: sometimes urged in justification of persons guilty of criminal acts of vengeance.
Origin
1635–45
British Dictionary definitions for unwritten-law
unwritten law
 
n
1.  the law based upon custom, usage, and judicial decisions, as distinguished from the enactments of a legislature, orders or decrees in writing, etc
2.  the unwritten law the tradition that a person may avenge any insult to family integrity, as used to justify criminal acts of vengeance

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