1
general::
Phrase(s): Silence is golden.
Prov. Silence is often good or desirable. • Jerry has two teenage children who listen to music using their headphones all day. He knows that silence is golden. • Hush! Silence is golden.
McGrawhill's American Idioms And Phrasal Verbs
2
general::
Keeping one's mouth shut is a great virtue, as in Don't tell anyone else about it? silence is golden. Although this precise phrase was first recorded only in 1848, it is part of a much older proverb, "Speech is silver and silence is golden."
American Heritage Idioms