1. to emerge or issue from a narrow or confined space into a wide, open area
Usage: often used of troops, rivers, or crowds; military/geographical contexts
2. to flow out or discharge (especially of a river into a larger body of water)
Usage: geographical/hydrological term

Examples

• The river debouches into the Atlantic Ocean after flowing through the valley.
• The soldiers debouched from the forest onto the open plain.
• Crowds debouched from the stadium after the game ended.
• The canyon debouches into a wide basin.
• The marching band debouched onto Main Street from the side road.