I'll tell you what
US /aɪl tɛl ju wʌt/
UK /aɪl tɛl ju wʌt/

1.
내가 말해줄게, 있잖아
used to introduce a suggestion or a solution to a problem
:
•
I'll tell you what, let's just order pizza tonight.
내가 말해줄게, 오늘 밤은 그냥 피자 시키자.
•
You're struggling with that? I'll tell you what, I can help you.
그거 힘들어? 내가 말해줄게, 내가 도와줄 수 있어.