agree to disagree
Of two parties, to mutually accept that they simply do not (and will not) share the same view on a particular issue, in the interest of moving past the issue or avoiding further confrontation. After their discussion about politics intensified, Fred and Sue had to agree to disagree before it impacted their friendship. I'm sick of arguing with you, so let's just agree to disagree and move on from this issue.
agree to disagree
Cliché [for two or more parties] to calmly agree not to come to an agreement in a dispute. We have accomplished nothing except that we agree to disagree.