http://wordsmith.org/words/gentlemens_agreement.html PRONUNCIATION:
(JEN-tl-manz uh-GREE-muhnt)
MEANING:
noun: An agreement that's based on honor and not legally binding.
ETYMOLOGY:
From the idea that a gentleman (a civilized man of good standing) will honor an agreement he has entered. Earliest documented use: 1886.
USAGE:
"Since the Iran-Iraq war, the two countries have had a gentlemen's agreement to maintain similar quotas within OPEC."
Carola Hoyos; Seismic Shock As Demand Shifts East; The Financial Times (London, UK); Mar 29, 2010.