"Radio silence" refers to the absence of communication or the intentional act of not receiving or sending any information using radios or other communication devices. It means there is a lack of any spoken or transmitted messages. Full definition
There has been a lot of radio silence on my end over the past month or so. (cameronproffitt.com)
I have been by far the worst blogger for the past couple of weeks and I truly apologize for my lack of posts, my complete and total radio silence on almost all platforms. (preppypanache.com)
If it wasn't obvious from my near radio silence over the last week, I'm entering my busiest work period of the year. (bedknobsandbaubles.com)