gagging order
noun [ C ] UK uk/ˈɡæɡ.ɪŋ ˌɔː.dər/ us/ˈɡæɡ.ɪŋ ˌɔːr.dɚ/ (US gag order)
（尤指禁止评论案件的）限制公开言论的命令，禁声令
an official order not to discuss something, especially a legal case
The judge issued a gagging order to prevent the witnesses from speaking to the press. 法官下了禁声令，以防证人对新闻界谈及案情。