TO PUT IT MILDLY


Meaning of TO PUT IT MILDLY in English

used to show that what you are talking about is much more extreme, etc. than your words suggest :

The result was unfortunate, to put it mildly (= it was extremely unfortunate) .

Oxford Advanced Learner's English Dictionary.      Оксфордский английский словарь для изучающик язык на продвинутом уровне.