a condition requiring all radio stations in an area to stop transmitting during a period of time; the period of time during which this condition exists
The military group was told not to break radio silence.
They hadn't heard any news at all in all the days of radio silence.
They thought of a dozen reasons why the message might have been delayed, but the radio silence continued.
And radio silence it had to be, even if the whole darn Nazi Luftwaffe was tearing out for a crack at the ferry bombers.