Pronunciation: (di-bOOsh', -bouch'),[key] —v.i. 1. to march out from a narrow or confined place into open country, as a body of troops: The platoon debouched from the defile into the plain. 2. Physical Geog. a. to emerge from a relatively narrow valley upon an open plain: A river or glacier debouches on the plains. b. to flow from a small valley into a larger one.
3. to come forth; emerge.