When soldiers debouch, they march out of a very narrow space. Troops might debouch out of a long pass between mountains, for example.

When military troops debouch, they march in a long, narrow line — sometimes single file — because of the width of the area they're moving through. As they debouch, the soldiers emerge in a larger area, like an open field. The narrow space is known as a defile in military terminology. The verb debouch has a French root, déboucher, which combines , or "removal," and bouche, "mouth."

Definitions of debouch

v march out (as from a defile) into open ground

“The regiments debouched from the valley”
march out
Type of:
march, process
march in a procession

v pass out or emerge; especially of rivers

“The tributary debouched into the big river”
Type of:
come forth, come out, egress, emerge, go forth, issue
come out of

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