v. i. [ imp. & p. p. Debouched p. pr. & vb. n. Debouching. ] [ F. déboucher; pref. dé- (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. ]