Definition of "outfall"

outfall¹

verb
third-person singular simple present outfalls, present participle outfalling, simple past outfell, past participle outfallen
1. (transitive, obsolete) To burst forth, as upon an enemy; make a sally.

outfall²

noun
plural outfalls
1. (obsolete) A sudden eruption of troops from a fortified place; sally.
2. (dialectal) A quarrel; a falling out.
3. The point or place of discharge of a river, drain, culvert, sewer, etc.; mouth; embouchure.
  Quotations
  West of Keswick a short descent at 1 in 122 brings the train down to the low-lying and marshy ground between Derwentwater and Bassenthwaite Lake and to the crossing of the Derwent - the outfall from Derwentwater, [...].
  1961 October, Voyageur, “The Cockermouth, Keswick & Penrith Railway”, in Trains Illustrated, page 601
  The rules focus primarily on two crucial operating features: seawater intakes and outfalls.
  2014 October 18, Matt Weiser, “Could desalination solve California’s water problem?”, in The Sacramento Bee‎, retrieved 20150315