Definition of do someone a good or bad turn in English:

do someone a good (or bad) turn

Do something that is helpful (or unhelpful) for someone: he was a friend of mine, and had done me some good turns over the previous few months
More example sentences
  • People are looking for the Cardinal to do them a good turn.
  • A journalist who, because she was from his own native county of Longford, decided to do her a good turn, found himself in court because Ms Johnson did not like the way her comments were treated in the Star.
  • It's not just the money because they also did us a good turn as players.
Synonyms
service, deed, act, action;
(a good turn)favour, act of kindness, kindness;
(a bad turn)disservice, wrong, harm, injury
See parent entry: turn

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Pronunciation: dɪˈmɒrəlʌɪz
verb
cause (someone) to lose confidence or hope