unwritten law ( synonym found)
Definition of unwritten law:

°Spoken or otherwise communicated other than in writing.
°Implicit or understood but not formally articulated.
"It's an unwritten law that you lock the gate when you leave the swimming pool."
Definition of unwritten law:

°Spoken or otherwise communicated other than in writing.
°Implicit or understood but not formally articulated.
"It's an unwritten law that you lock the gate when you leave the swimming pool."
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