The act of flowing out or emptying, especially when a river discharges into the sea or ocean.
From French 'disemboguer,' combining 'dis-' (out) and Spanish 'embocadura' (mouth of a river), ultimately from Latin 'bucca' (mouth). The term evolved to describe the geographical phenomenon of water bodies opening into larger ones.
This wonderfully obscure word describes exactly what happens at river deltas—where the Mississippi disembogues into the Gulf of Mexico. It's the kind of specialized geographical vocabulary that mapmakers once used regularly but modern English speakers have mostly forgotten.
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