прямо заявлять отказ от(The Parties expressly waive any right they may have to object that the Notices of Transfer issued by the Disposing Participant and Consents to Transfer ... | The Promoter shall be purchasing the Smartphone device from a third party vendor and therefore is not responsible for its quality, and you expressly waive any claims against the Promoter in this regard.)
простить долг(we mentally associate A's duty to do x with a debt owed to B; the idea being that just as B may waive a debt that is owed to her, so she can waive A's duty to do ... Alexander Demidov)
простить долг(And Sir Richard offered to waive the debt if you gave him the evidence of the ministers' guilt? "Downton Abbey" Season 2 Episode 3 kozelski)