do by someoneTreat or deal with someone in a specified way.
‘he slipped away almost unnoticed, leaving Matt feeling that somehow they had done badly by the old man’
‘do as you would be done by’
‘If he had done badly by her he knows I'd put his teeth halfway down his throat.’
‘Then he began to have a faint inkling that he was being treated leniently, and to think that they had done kindly by him, in not yielding to his wish.’
‘My mother, bless her soul, had done well by me in making me learn to sew at an early age.’
Are You Learning English? Here Are Our Top English Tips