Runaway is an English word with several related but distinct senses. In general it describes a person, animal, machine or process that has escaped control or has moved away from its usual position or authority. The term appears in legal, social, technical and everyday language and is also widely used as a title in arts and media.

Human and social meaning

When applied to people, runaway most often refers to a child or adolescent who leaves home without parental permission. Reasons vary and may include family conflict, abuse, neglect, or a desire for independence. Runaway youth face risks such as homelessness, exploitation, substance use, and disrupted education and health care. Responses typically combine prevention, family support, social services and legal protections; many jurisdictions treat minors differently from adult fugitives.

Vehicles, animals and machinery

A runaway vehicle or animal is one moving uncontrollably: a runaway train, truck, horse or elevator. Causes include mechanical failure, loss of braking, operator error or environmental factors. Safety measures include emergency braking systems, runaway ramps on mountain roads, containment barriers, and training for operators. Quick intervention aims to reduce harm to people and property.

Runaway processes

In science and economics the adjective describes self-reinforcing, accelerating phenomena: a runaway chemical reaction that releases heat faster than it can be removed, a runaway greenhouse effect in climatology, or runaway inflation in an economy. These situations share positive feedback loops that can produce rapid, often dangerous change unless moderated by controls or interventions.

Cultural and figurative uses

As a noun or adjective, runaway is common in titles of songs, films and books and in phrases such as "runaway success" or "runaway victory," meaning an overwhelming or unexpected result. Its frequent use in popular culture reflects the term's emotional immediacy and adaptability.

Distinctions and notable facts

  • Legal vs colloquial: a "runaway" child may be treated differently from a criminal fugitive.
  • Voluntary vs involuntary: not all runaways choose their situation—mechanical failures and natural processes can lead to runaway outcomes.
  • Prevention and mitigation differ by context: social services for people, engineering controls for machines, and policy measures for economic or environmental runaways.