"echo your sentiment" is correct and usable in written English. You can use this phrase when you want to show agreement with another person's thought or feeling. For example, you could say: "I completely understand what you are saying - I echo your sentiment."
Most survivors echo your sentiment that while they are going through treatment, they are not concerned about having sex.
Thus, we echo your sentiment calling for open discussions, but recognize that first, the fundamentals of research on screening for cancer must be re-examined.
I also echo your sentiments about keeping up the tone.
I echo your sentiments, sir. I need my family to live in peace, too.
I'm sure everyone echoes your sentiments, Emil.
Meanwhile there are those ladies in New York, who dine out on what you've said and though echoing your sentiments, get to say, "Betsy says...."....
The Patriots echo that sentiment.
Constitutional law experts echo this sentiment.
I know cartoonists would echo that sentiment.
More modern writers echo the sentiment.
All the girls echo her sentiment.
Ludwig does not simply clarify my doubts with English writing, it enlightens my writing with new possibilities
Simone Ivan Conte
Software Engineer at Adobe, UK