Why Do We Say “In One Fell Swoop”?

The Shakespearean Origin of a Dramatic Idiom

The phrase “in one fell swoop” means something happening all at once, in a single action or moment. You might say:

  • “She finished her entire to-do list in one fell swoop.”
  • “The new policy wiped out three departments in one fell swoop.”

But while it sounds poetic today, its original meaning was darker — and it comes straight from Shakespeare.


📜 The Dark Origin in Macbeth

The first known use of “in one fell swoop” appears in Macbeth, written around 1605–1606. In Act IV, Scene III, Macduff learns that Macbeth has had his wife and children murdered:

“All my pretty chickens and their dam
At one fell swoop?”

Here, “fell” means fierce, cruel, deadly — not “fall.” It comes from the Old French fel, meaning “evil” or “savage.”

“Swoop” referred to the sudden dive of a bird of prey. So “one fell swoop” meant:

One savage strike from above.

Shakespeare used it to describe a sudden, devastating attack.


🦅 How the Meaning Softened

Over the centuries, the violent imagery faded. By the 18th and 19th centuries, the phrase began appearing in newspapers and literature to mean “all at once” — not necessarily with deadly consequences.

Examples from the 1800s show it being used for:

  • Political decisions
  • Large-scale changes
  • Sudden events

The predatory bird imagery stuck around metaphorically, but the cruelty of “fell” was largely forgotten.


📖 Modern Examples

Today, you might hear:

  • “They redecorated the entire house in one fell swoop.”
  • “The company eliminated outdated policies in one fell swoop.”
  • “The storm knocked out power to the whole region in one fell swoop.”

The context is usually neutral or slightly dramatic, but rarely as violent as Shakespeare intended.


🔄 Related Phrases

If you like “in one fell swoop,” you might also use:

  • All at once – Completely, in a single moment.
  • In one go – Informal British version.
  • In one stroke – Suggests decisive action.

📚 Why It Endures

Shakespeare gifted the English language hundreds of phrases, but “in one fell swoop” stands out for its vivid metaphor. Even without knowing its origin, it feels dramatic, final, and complete — perfect for storytelling and speech.


❓ FAQs

Q: Does “fell” mean “fall” here?
A: No. “Fell” in this phrase means cruel or deadly, from Old French fel.

Q: Can I use it for positive things?
A: Yes. While it began with a grim meaning, it’s now used for both positive and negative sudden actions.

Q: Is it still common today?
A: Yes. It appears in literature, journalism, and everyday conversation, though often in more formal or dramatic contexts.


📌 Final Thought

Next time you say “in one fell swoop,” remember: you’re channeling Shakespeare, a falcon in a deadly dive, and 400 years of English history — all in one phrase.