“There is a generally accepted rule in English contract law that informal agreements between the parties may be binding if there is an `intention to create legal relationships`. Etymologists and historians are not sure how the expression came about and who first used it. Etymologists study the history and origin of words and phrases and how they evolved. What prompted you to look for a gentleman`s agreement? Please let us know where you read or heard it (including the quote, if possible). The phrase appears in the records of the British Parliament and 1835 in the Massachusetts public records.  The Oxford English Dictionary cites Mr. Mulliner Speaking`s 1929 collection of stories as the first publication of the term.  Gentlemen`s agreements are also found in trade agreements and international relations. One example is the gentlemen`s agreement of 1907, in which the United States and the Japanese Empire referred to immigration from Japan and the mistreatment of Japanese immigrants already in America.
The agreement, which was never ratified by Congress, provided that Japan would no longer issue passports to people wishing to immigrate to America to go to work. The United States, on the other hand, would no longer allow discrimination and segregation of Japanese citizens residing in the United States. A gentleman`s agreement is an informal, non-binding agreement in which the parties trust each other to keep their promises. We can also use the plural and say “gentlemen`s agreement”. It is usually not a document, that is, there are no signatures, papers or writings. If one of the parties violates the agreement, the others usually have no recourse to the courts. . . .