Meanings
Mondegreen variant of in one fell swoop, where "fell" (of a strong and cruel nature; eager and unsparing; grim; fierce; ruthless; savage) is misheard as "foul" (disgusting) or "fowl" (a bird).
(Achieved or completed) with a single action; in a single stroke.
Example Sentences
1
The tornado swept through the town, destroying everything in one foul swoop.
2
The new company policy eliminated all the old procedures in one foul swoop.
3
The thief stole all the money from the bank in one foul swoop.
4
The manager fired three employees in one foul swoop.
5
The new regulations changed multiple laws in one foul swoop.