Wiktionary
break silence
vb. To breach a norm against communication or against communicating a specific type of information.
Usage examples of "break silence".
The difference, this time, was that Dr Langer was authorized to break silence, if he judged that necessary, and let the Heart Stars know that Earth was looking back at them.
De Bracy was the first to break silence by an uncontrollable fit of laughter, wherein he was joined, though with more moderation, by the Templar.