Definition of to put it mildly (or putting it mildly) in US English:

to put it mildly (or putting it mildly)

phrase

  • Used to imply that the reality is more extreme, usually worse.

    ‘the proposals were, to put it mildly, unpopular’
    • ‘His musical career has been uneven, to put it mildly.’
    • ‘That particular part of the story has been, to put it mildly, well-covered.’
    • ‘The difference that makes is considerable, to put it mildly.’
    • ‘But the PM's handling of this has been a little awkward, to put it mildly.’
    • ‘These are, to put it mildly, extremely limited measures, if not worse.’
    to put it mildly, putting it mildly, without any exaggeration, at the very least, as an understatement
    View synonyms