to fail to keep a promise; to change your mind about sth :
He never goes back on his word (= never fails to do what he has said he will do) .
to fail to keep a promise; to change your mind about sth :
He never goes back on his word (= never fails to do what he has said he will do) .
Oxford Advanced Learner's English Dictionary. Оксфордский английский словарь для изучающик язык на продвинутом уровне. 2005