From Longman Dictionary of Contemporary Englishnot to saynot to sayespecially British EnglishEXPRESS used when adding a stronger description of something The information is inadequate, not to say misleading. → say
Examples from the Corpus
not to say• Both men wield wonderful, not to say mythic, influence to this day.• This is not to say that all criticism is unjustified.• That's not to say that all the tracks will be jazz-heavy.• That is not to say that he was not interested in spending it.• That is not to say that Reagan was not content to see socialists replaced by conservatives in the natural course of events.• That is not to say that the quality of information upon which decisions were made and discretion exercised was always adequate.• Which is not to say they were an unending pleasure. 