De·bouch v. i. [imp. & p. p. Debouched p. pr. & vb. n. Debouching.] To march out from a wood, defile, or other confined spot, into open ground; to issue.
Battalions debouching on the plain. --Prescott.
2. Geog. To issue; -- said of a stream passing from a gorge out into an open valley or a plain.
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