I'm with you
I agree with you. A: "Ugh, why did we have to get up so darn early?" B: "Hey, I'm with you—I'd rather sleep in. This early wake-up call was all Mom's idea."
I'm with you.
I agree with you.; I will join with you in doing what you suggest. (With a stress on both landyow.) Sally: I think this old bridge is sort of dangerous. Jane: I'm with you. Let's go back another way. Bob: This restaurant looks horrible. Bill: I'm with you. Want to go somewhere else?