Silence is golden - Cultural Definition
The New Dictionary of Cultural Literacy Copyright © 2010 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Silence is of great value.
silence is golden - Phrases/Idioms
The American Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 2003, 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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.”