gentleman's agreement
US /ˌdʒen.tl.mənz əˈɡriː.mənt/
UK /ˌdʒen.tl.mənz əˈɡriː.mənt/
1.
an agreement that is not legally binding but is based on the honor of the parties involved
:
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They reached a gentleman's agreement to share the profits equally.
•
The deal was based on a gentleman's agreement, not a written contract.