put (one) under a gag order

To subject one who is involved in a court case to a legal order prohibiting one from public sharing of or commentary on its details. Unfortunately, we have been put under a gag order, meaning we can't provide any new information to the press about the trial until it is finished. The defense has asked the judge to put everyone involved in the case under a gag order to ensure that the jurors are not influenced by biased media coverage.