Webster’s Revised Unabridged Dictionary · 1913
Debouch
De·bouch′ (dē·bo͞osh′), 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.
Battalions debouching on the plain. Prescott.