Verb
put it mildly (third-person singular simple present puts it mildly, present participle putting it mildly, simple past and past participle put it mildly)
To state without exaggeration; to understate, to state in euphemistic terms.
to put it mildly
That's putting it mildly!
The unavoidable spread of South Korean capital and information will put the North Korean government in a tight spot, to put it mildly. Andrei Lankov
To dissociate politicians from capitalists is slightly disingenuous, to put it mildly. U.S. lawmakers are competitive and auction themselves to the highest bidder via the lobby system. Tariq Ali
Health care is a design problem. Dependence on foreign oil is a design problem. To some extent, poverty is a design problem. We need design thinkers to solve those problems, and most people who are in positions of political power are not design thinkers, to put it mildly. Daniel H. Pink
In '74 it was really a very gloomy atmosphere, I would say, to put it mildly. Mikhail Baryshnikov