three night rule
a sacred custom dictating that if someone is not a family member or an intimate friend, then one may only sleep in their house/apartment for three nights at most. Violating this is a high offense against one's honor. Go to a hotel.
Rather than spend a fourth night in Alex's San Francisco apartment, Bob took a train to San Jose and slept in a ditch. This way, he observed the three night rule and preserved his sacred honor.
three night rule by Col. Hans Landa September 13, 2013
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