Isaiah 23:2

Be still "Be silent" - Silence is a mark of grief and consternation. See Isaiah 47:5 . Jeremiah has finely expressed this image: -

"The elders of the daughter of Zion sit on the ground, they are silent:

They have cast up dust on their heads, they have girded themselves with sackcloth.

The virgins of Jerusalem hang down their heads to the ground."

Lamentations 2:10 .