When someone dosen't return phone calls or text messages. Most commonly used when trying to develop a relationship with someone.

Got the covid-19 vaccine

When all work communication has stopped. No phone calls or e-mails are received. No one leaves their cubicle. All transmissions have ceased. Typically happens at work when holidays and/or vacation approach.

the necessary, but unfortunate silence that must be called when two people who have an awesome first date, but have to part ways to different cities and become progressively less productive as they text like crazy.

Keep something secret; don't let the word spread.