Definition of I (or I'll) tell you what in English:

I (or I'll) tell you what

phrase

  • Used to introduce a suggestion.

    ‘I tell you what, why don't we meet for lunch tomorrow?’
    • ‘Listen, if you don't like it, I'll tell you what: sublet me your place.’
    • ‘You can be optimistic, but I'll tell you what, don't let your guard down.’
    • ‘But I'll tell you what, I'll gladly donate my tax cut to a worthy charity if you will.’
    • ‘And I'll tell you what, we will try to bring her back - do you think we will be able to do that?’
    • ‘I'll tell you what, instead why don't you write a column about an outing with a girl?’