a period of time when nothing is broadcast by radio

Radio silence may be imposed on other stations during a distress call. 在收到求救信号后，其他电台被要求保持电波静默。

a period of time when someone does not communicate with another person or other people

He texted me every day for a week, and then: radio silence. 他每天向我发短信，这样保持了一周，然后就是静默了。