run water over the ground to erode (soil), revealing the underlying strata and valuable minerals(verb.change)
source: wordnet30
To still; to silence; to calm; to make quiet; to repress the noise or clamor of.(verb)
source: webster1913
To become or to keep still or quiet; to become silent; -- esp. used in the imperative, as an exclamation; be still; be silent or quiet; make no noise.(verb)