[1] : The Collaborative International Dictionary of English v.0.48

debouch \debouch"\, v. i. imp.  p. p. debouched; p. pr. 
   vb. n. debouching. f. d'eboucher; pref. d'e- l. dis-
   or de + boucher to stop up, fr. bouche mouth, fr. l. bucca
   the cheek. cf. disembogue.
   to march out from a wood, defile, or other confined spot,
   into open ground; to issue.
   1913 webster

         battalions debouching on the plain.      --prescott.
   1913 webster

   2. geog. to issue; -- said of a stream passing from a gorge
      out into an open valley or a plain.
      webster 1913 suppl.
see also:
debouched debouching disembogue 

Debouched >> D Words
Debouched, definition of term: Debouched
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