One Fell Swoop Meaning

(idiomatic) One stroke; one action or event with many results.

Example:   Changing the oil lubricates the engine and removes debris in one fell swoop.
1605, William Shakespeare, Macbeth, act iv, scene 3:
  What, All my pretty Chickens, and their Damme
At one fell Å¿woope?
1922, James Joyce, Ulysses, Episode 16:
  ...they might be hanging about there or simply marauders ready to decamp with whatever boodle they could in one fell swoop at a moment's notice, your money or your life, leaving you there to point a moral, gagged and garrotted.