From Longman Dictionary of Contemporary Englishdo somebody ↔ down phrasal verbCRITICIZEto criticize someone, especially in an unfair way I know you don’t like him, but there’s no need to keep doing him down in front of the boss. → do→ See Verb table
Examples from the Corpus
do down• All he can do is call down to the sheriff in Baudette.• All the egg has to do is roll down the other tube.• Father, do please sit down here.• However, machines do break down and power supplies sometimes fail.• I do that riding down the road, make up my own stories about people and places.• In many companies, stated corporate values and policies do not filter down to the day-to - day actions of the firm.• Now all Madame Butterfly had to do was climb down a piece of wood twice her height and fly free.• Slowing down does not help, and generally the driver is not brave enough or quick enough to try accelerating. 