From Longman Dictionary of Contemporary Englishif I may say soif I may say so (also if I might say so) formal used to be polite when saying something that may embarrass or offend the person you are talking to That’s just the point, Mr Glover, if I may say so. → say
Examples from the Corpus
if I may say so• Suicidal, if I may say so.• Very sexist of you to assume otherwise, if I may say so.• For my interior vision, if I may say so, it still works.• And his manner was, if I may say so, more relaxed, almost like an aristocrat.• Unlike, if I may say so, the dabblings of your brother in the theology of physics.• And if I may say so, they seem more useful than yours.• Now, you're a plants-woman of no small renown, if I may say so, your ladyship. 