Clarifying your own ideas

In other words,

What I mean is . . .

What I'm trying to say is . . .

What I wanted to say was . . .

To clarify,

Asking for Clarification

What do you mean (by that)?

What are you trying to say?

What was that again?

Could you clarify that?

Clarifying another's ideas

You mean . . .

What you mean is . . .

What you're saying is . . .

(I think) what she means is . . .

What he's trying to say is . . .

If I understand you, (you're saying that . . . )

If I'm hearing you correctly,

So, you think (that) . . .

So, your idea is . . .