1) Come forth 2) March 3) March out 4) March out into open ground 5) March out into the open 6) Pass out or emerge 7) Process 8) Water stream 1) Emerge 
Debouch from French origin meaning to cause to emerge and is a term used in river, stream and glacier geography. The term also has a military usage. ==Geology== In fluvial geomorphology a debouch is when runoff from a small, confined space emerges into a larger, broader space. Common examples are when a stream runs into a river or when a river run...
to issue or emerge; to flow from a confined place
• (v. i.) To march out from a wood, defile, or other confined spot, into open ground; to issue. • (v. i.) To issue; -- said of a stream passing from a gorge out into an open valley or a plain.
De·bouch' intransitive verb [ imperfect & past participle Debouched ; present participle & verbal noun Debouching .] [ French déboucher ; prefix dé- (L. dis- or de ) + boucher to stop up, from ...
Type: Term Pronunciation: dā-būsh′ Definitions: 1. To open or empty into another part.
[v] - march out (as from a defile) into open ground 2. [v] - pass out or emerge
march out verb march out (as from a defile) into open ground; `The regiments debouched from the valley`
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. · A river or glacier debouches on the plains. · to emerge from a relatively narrow valley upon an open plain:A river or glacier debouches on the plains. · to flow from a small valley into a la...