unwritten agreement

For decades the governments in Beijing and Taipei had an unwritten agreement not to stray across a median line that divides the 110-mile-wide strait between them.

In her final annual report, Amanda Spielman says the "unwritten agreement" ensuring families take their children to school and respect the policies, in return for a good education, "will take time to restore".

The U.S. goal is to reach an informal, unwritten agreement, which some Iranian officials are calling a “political cease-fire.”

The U.S. goal is to reach an informal, unwritten agreement, which some Iranian officials are calling a “political cease-fire.”

The compound’s oversight is handled by an Islamic trust called the Waqf, controlled and funded by Jordan under an unwritten agreement with Israel, which has overall security authority and maintains a small police station inside.