embogue

from The Century Dictionary.

• To discharge itself, as a river, at its mouth; disembogue; debouch.

from the GNU version of the Collaborative International Dictionary of English.

• intransitive verb rare To disembogue; to discharge, as a river, its waters into the sea or another river.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• verb archaic To disembogue; to discharge, as a river, its waters into the sea or another river.