one fell swoop
After Shakespeare, in Macbeth, act iv, scene 3, where Macduff learns his wife and entire family are murdered:
- Ro. Wife, Children, Servants, all that could be found. […]
- Macd. […] All my pretty ones?
Did you say All? Oh Hell-Kite! All?
What, All my pretty Chickens, and their Damme
At one fell swoope?
The imagery is of a bird of prey ("hell-kite") ransacking a whole nest at one blow, fell meaning "terrible, cruel, savage." In later uses of the expression, the force of the metaphor is reduced or lost.
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- (idiomatic) One stroke; one action or event that achieves or accomplishes many results.
- Changing the oil lubricates the engine and removes debris in one fell swoop.
- ...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.