From Longman Dictionary of Contemporary Englishdescend to something phrasal verbBEHAVEto behave or speak in an unpleasant way, which is not the way you usually behave SYN stoop to Surely he wouldn’t descend to such a mean trick?descend to somebody’s level (=behave or speak as badly as someone else) Other people may gossip, but don’t descend to their level. → descend→ See Verb table
Examples from the Corpus
descend to somebody’s level• But soon after that he descended to an unreachable level.• However, it is important that we do not descend to their level.• If I use violence I descend to his level.• Otherwise nothing useful will be achieved and, instead of debate, we shall descend to the level of vulgar slanging matches.• Flying over Normandy he descended to ground level to escape the fog and to find his bearings. 