Definition of I know in US English:

I know

phrase

  • 1I agree.

    ‘“It's not the same without Rosie.” “I know.”’
    • ‘‘She'll be really annoyed if you sneak off to go drinking with us at some bar. Especially without her.’ ‘I know.’’
  • 2I have a new idea or suggestion.

    ‘I know what, let's do it now’
    • ‘I know what, why don't we grab a little bite downstairs and then I'll take you by the house so you can meet the guys.’
    • ‘I know what! I'll fix strawberries just the way you like them! What do you say to that?’