1. over the side of a ship or boat into the water
Usage: nautical
2. to an excessive degree; too far
Usage: informal; used in phrase ‘go overboard’

Examples

• The sailor fell overboard during the storm.
• Someone threw the old rope overboard.
• Don’t go overboard with the decorations for the party.
• She went overboard buying gifts for her children.
• The captain ordered all unnecessary cargo thrown overboard.
• He tends to go overboard when he gets excited about something.
• The life preserver was tossed overboard to the drowning swimmer.