Meaning of the Idiom
“On the run” typically means someone is fleeing or escaping, often from the law or a dangerous situation. It can also refer to being constantly busy, moving quickly from one place or task to another, with little rest.
Origin
The phrase comes from the literal idea of running to avoid being caught. It has been used since at least the 19th century in both criminal and non-criminal contexts. The expression became popular in crime novels, movies, and news reports, usually referring to fugitives.
Usage
This idiom can be used in two common ways:
- To flee from authorities or danger:
- “The suspect has been on the run for three days.”
- “They’ve been on the run since breaking out of prison.”
- To be extremely busy and constantly in motion:
- “I’ve been on the run all day with errands.”
- “She grabbed a sandwich to eat on the run.”
The context makes it clear whether it refers to escaping or being very active.
Figurative Use
Figuratively, “on the run” can describe a hectic lifestyle, especially in modern urban life where people are always hurrying. It may also imply a lack of time for reflection or rest. In contrast, in fiction or news, it often evokes suspense and urgency when someone is evading capture.
Summary
“On the run” means either fleeing from danger or being constantly on the move due to a busy schedule. It can describe both literal escape and figurative hustle, depending on context. The phrase is flexible but always suggests urgency and motion.
Idiom Study 
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