1. to emerge or issue from a narrow or confined space into a wide, open area
Usage: often used of troops, rivers, or crowds
2. (of a river or stream) to flow out into a larger body of water
Usage: geographical/hydrological context
3. (military) to march out from a defile or confined position into open ground
Usage: military/historical

Examples

• The narrow canyon debouches into a vast desert plain.
• Thousands of spectators debouched from the stadium after the game ended.
• The river debouches into the Atlantic Ocean near the city.
• The soldiers debouched from the mountain pass and formed ranks on the valley floor.
• Crowds debouched onto the streets to celebrate the holiday.
• The small stream debouches into the larger river system.
• After passing through the gorge, the hiking trail debouches onto a scenic overlook.