or gentleman's agreement
an agreement that, although unenforceable at law, is binding as a matter of personal honor.
an unwritten agreement by a socially prominent clique, private club, etc., to discriminate against or refuse to accept members of certain religious, racial, national, or other groups.
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Origin of gentlemen's agreement
An Americanism dating back to 1885–90
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
British Dictionary definitions for gentlemen's agreement
a personal understanding or arrangement based on honour and not legally binding
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012