- march out (as from a defile) into open ground; "The regiments debouched from the valley"
- pass out or emerge; especially of rivers; "The tributary debouched into the big river"
- In geography, a debouch is a place where a body of water pours forth from a narrow opening. Some examples are where a stream emerges from a narrow place like a defile into open country or a wider space; a creek joins a river; or a stream flows into a lake.
- verb - 1. [military] to come forth from a narrow or shut-in place into open country 2. to come forth; to emerge (N.B. a debouche is an outlet, as for troops to debouch through, and a debouchment is a mouth, as of a river; an outlet)