Leverage" originates from the Old French levier (12th century), meaning "a lifter" or "crowbar", derived from Latin levare ("to raise") and levis ("light in weight").  It reflects the Poto-Indo-Euroopean root legwh-, meaning to make something "not heavy".  The term signifies using a mechanism to make a heavy task light.  Leverage is closely related to words conveying lightness or raising, such as: alleviate (to make lighter), elevate (to raise up), levity (lightness of manner), and relevant (to raise up/bring to bear).

According to the Oxford English Dictionary (OED), the earliest known use of the noun "leverage" is from 1724, appearing in the London Gazette to describe the action or mechanical power of a lever.  Originally was formed by adding "age" to the noun lever, OED cites usage from 1297 in [Robert of Gloucester's Chronicle], and referred to the mechanical advantage of a lever.  The first figurative use of leverage was in 1858, and used for influence or power to accomplish a purpose.  Usage of the financial sense of the word leverage was 1933/1937 and used to describe using borrowed capital.  The verb form of "leverage" appeared in the 1930s, with OED evidence from 1937.  

Leverage in storytelling is the strategic use of narrative elements—such as tension, emotion, and structure — to amplify impact, maximize audience engagement, and achieve a specific goal with "less effort" or resources.  It is the process of turning a simple anecdote into a powerful tool that resonates deeply, builds trust, and influences behavior.  

Here is the importance of leverage in storytelling, broken down by key areas:  
Maximizing Emotional Impact and Retention: 
Brain Engagement: Stories that leverage emotional, personal, and well-structured narratives (introduction, conflict, change) engage more of the brain, making the message up to 22 times more memorable than facts alone. 
Creating Tension: Leverage involves managing uncertainty. By highlighting a "porthole" or a specific, high-stakes moment—like Luke Skywalker aiming for the small exhaust port in Star Wars—storytellers can amplify emotional resonance, making the audience feel as though they are experiencing the tension themselves.  
The Power of Change: The core of effective storytelling is the transformation at the end. Leveraging this change helps pull the audience along emotionally.