ˈ ̷ ̷ˌ ̷ ̷ noun
Etymology: out (III) + fall (after fall out, v.)
1.
a. : the mouth or outlet of a river, stream, or lake
b. : the lower end of a watercourse or the part of any body of water where it drops away into a larger body
c. : the vent of a drain or sewer
2. : raid , sortie
storms, onslaughts and outfalls — Sir Walter Scott