One of the mysteries of the English language finally explained.
1Fuel for a rocket engine; specifically one that reacts with an oxidizer.
2In extended use: something which has a stimulating or energizing effect; specifically a strong alcoholic drink.
3Slang (originally US). The veterinary analgesic and anaesthetic phencyclidine, used as a recreational drug.
1930s; earliest use found in Popular Science Monthly. From rocket + fuel.
rocket fuel/ˈrɒkɪt ˌfjuːəl/
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