do by someone or something|do by イディオム
do by someone or something|do by
v. To deal with; treat.

Used with a qualifying adverb between "do" and "by".
Andy's employer always does very well by him.do by addition or something|do by
v. To accord with; treat.

Used with a condoning adverb amid "do" and "by".
Andy's employer consistently does actual able-bodied by him. Dictionary