At equal fault.
(law) In pari delicto describes a case in which involved parties are mutually or equally at fault. In such cases where a party's own conduct is mutually wrongful, that party may not claim damages or satisfaction from the other(s) in a court of law.
Origin of in-pari-delicto
- Latin in pari delicto potior est conditio defendentis: "if both (parties) are in the wrong, a defence is set up".