From Longman Dictionary of Contemporary Englishdrop anchordrop anchorTTWto lower a boat’s anchor to the bottom of the sea, a lake etc so that the boat does not float away → drop
Examples from the Corpus
drop anchor• While Pottz tacked to and fro energetically seeking out the elusive peak, Richie dropped anchor and contemplated the horizon.• The ship finally dropped anchor at a beautiful isle of the Marquesas.• On June 9,1741, the Centurion dropped anchor at last at Juan Fernandez.• Clayt was forced to drop anchor in open water.• Everybody said that Floyd Johnson probably dropped anchor somewhere to wait to the next day instead of coming in in the fog.• We dropped anchor there, and the fishermen disappeared back into harbour, leaving us to our fate. 