I'm looking for some precise and concise ways of saying:

I may or may not have understood you and will confirm by repeating it back to you: [...]

"In other words, [...]?" seems to be used often, but I feel like without the question mark it means:

I understood what you said and will prove it by repeating it back to you: [...]

I realize the inflection of a statement is often the only thing separating "I think" from "I'm sure," but I'm wondering if there are other options besides "in other words."

I'm looking for some precise and concise ways of saying:

I may or may not have understood you and will confirm by paraphrasing: [...]

"In other words, [...]?" seems to be used often, but I feel like without the question mark it means:

I understood what you said and will prove it by paraphrasing: [...]

I realize the inflection of a statement is often the only thing separating "I think" from "I'm sure," but I'm wondering if there are other options besides "in other words." I say "paraphrasing" but it doesn't necessarily need to imply that I'll definitely be using different words, just needs to imply that I am not positive I understood.

Note: To explain some of the answers below, this was previously titled Echoing to confirm that I understand; however, I edited it as one user pointed out echoing means specifically a word-for-word repetition and that is not necessarily what I'm looking for.