cast adrift
1. Literally, of a ship or sailors, to float on a body of water without control or anchorage. The team was cast adrift in the Atlantic for 17 days before a rescue party found them.
2. To be let go, freed, or lost. Likened to a ship that drifts without an anchor or moorings to a dock. When I arrived in the country, I found myself cast adrift in a city I didn't know, among people whose language I couldn't speak. With my inheritance money, I was cast adrift to pursue whatever life I fancied.