Explanation:

- The phrase refers to a sudden rush of a large number of frightened people or animals.

- Option 1: Lunacy

- Means insanity or madness.

- Not related to the sudden rush of people or animals.

- Option 2: Recluse

- Describes someone who lives in solitude.

- Does not relate to a sudden rush.

- Option 3: Stampede

- Refers to a sudden, panicked rush of a group, usually of animals or people.

- This is the correct word that captures the essence of the phrase.

- Option 4: Scapegoat

- Refers to a person or thing blamed for the wrongdoings of others.

- Does not describe a rush.