D defs.my
Entry 1 sense Webster, 1913

Gentlemen's agreement

/jĕn'-təl-mĕnzˌ əg-rēm'-ənt/ · Gen·tle·men's a·gree·ment · IPA
01 An agreement binding only as a matter of honor; often, specif., such an agreement among the heads of industrial or merchantile enterprises,…
  1. 1.
    An agreement binding only as a matter of honor; often, specif., such an agreement among the heads of industrial or merchantile enterprises, the terms of which could not be included and enforced in a legal contract.