The phrase "acknowledge once again" is correct and usable in written English.
It can be used when you want to emphasize that you are recognizing or affirming something that has been mentioned previously.
Example: "I would like to acknowledge once again the hard work and dedication of our team in completing this project."
Alternatives: "reiterate" or "reaffirm".
"As we reflect on the events of the past few months, we would like to acknowledge once again the overwhelming warmth and affection shown towards our son.
That said, I'd also like to acknowledge once again the disappointment we all feel and the discomfort associated with being surprised with bad news.
We acknowledge, once again, Muslim contribution to our country and welcome it; welcome those who visit in peace; welcome those who know that in this country, the respect and tolerance towards others, which we believe in, is the surest guarantee of freedom and progress for people of all religious faiths.
"We acknowledge once again that not everyone will be content with the decision made tonight - this was always going to be the case whichever way it turned out".
And it's time to acknowledge, once again, that we have much more to do.
If Bernie clinches more pledged votes than Clinton, superdelegates will peel away from the "inevitable nominee," and the media will be forced to acknowledge once again that this is a competitive election.
"During the committee session, Dave acknowledged once again his own mistakes in handling the issue over recent months," he said.
Francis acknowledges once again the welcoming parts of the Catechism and omits any mention of the condemnatory parts.
One week later they added that his DNA did not match the partial DNA profile obtained from the hijacker's tie, but acknowledged, once again, that there is no certainty that the hijacker was the source of the organic material obtained from the tie.
Don't give them the satisfaction, time, or day as it shows you are acknowledging them once again.
Like Oprah Winfrey, who recently acknowledged that she once again weighs more than 200 pounds, the contestants say that the slide backward can be slow, but for some of them it may be inevitable.
