Silence is so delicate, that saying its very name will break it. The key to answering this riddle is that one needs to "break their silence" to solve the question in the manner requested.
Riddles are puzzles that can be either metaphorical -- relating two unrelated things -- or allegorical -- an extended metaphor that conveys hidden meanings. Both are meant to convey a double or hidden meaning.
A popular riddle goes, "Here on earth it is true, yesterday is always before today. However, there is a place where yesterday always follows today. Where is it?" The answer: the dictionary.
Another popular riddle goes, "What is the one thing that everyone does at the same time?" The answer: everyone ages.