Drift anchor is a nautical device used to slow down the speed or stop the movement of a boat or ship when drifting in rough waters. There are several synonyms for drift anchor, which include sea anchor, drogue, drag sail, downhaul, and parachute anchor. A sea anchor is similar to a drift anchor and is commonly used by sailors to prevent their boat from being pushed by strong currents. A drogue is used for the same purpose but has a different design. A drag sail is a device used to slow down the speed of a boat while sailing downwind. Downhaul is a rope attached to the sail, which is used to bring it down. Lastly, the parachute anchor functions like a parachute and is used to stop the boat's movement during an emergency.