1. to emerge or issue from a narrow or confined space into a wide, open area
Usage: often used of rivers, streams, or military forces
2. to march out from a defile or confined position into open ground
Usage: military term

Examples

• The river debouches into the Atlantic Ocean after flowing through the valley.
• The troops were debouching from the mountain pass onto the plains.
• The stream debouches from the forest into a wide meadow.
• After hours in the canyon, the hikers were debouching into bright sunlight.
• The military column debouched from the narrow road into the open battlefield.