Throw somebody/something overboard
Definition 1 of 2
Pro Tip 1/3Emergency Action
Used when drastic measures are required to solve a critical problem, like to prevent a disaster. 
To stop the flooding, they had to throw the damaged equipment overboard.
Pro Tip 2/3Historical Usage
Originates from maritime practices, symbolizing the need for immediate, decisive action. 
Pirates would often throw captives overboard if they were seen as a threat.
Pro Tip 3/3Literally Physical
Involves physically removing something tangible, not just concepts or ideas. 
In the storm, we had to throw the anchors overboard to stabilize the ship.