runaway

A person or animal that runs away or has run away; a person, animal, or organization that escapes captivity or restrictions.

• Runaways are vulnerable to criminal exploitation.

A vehicle (especially, a train) that is out of control.

• Runaways are rendered impossible, as the machine can be instantly stopped by means of a double brake connected with the driver's seat
• We hear many ideas advanced as to the cause of engines running away, more especially in electric stations, while the wonder is that the runaways are so few.

An object or process that is out of control or out of equilibrium.attributivefigurativelyusually

• A trim runaway can make an airplane almost impossible to fly.

The act of running away, especially of a horse or teams.

• The drivers were generally boys […] They would stop the team when other boats passed and at locks while waiting for the water to rise or fall. They could also be useful in preventing or stopping runaways. Horses were easily startled and mig

An overwhelming victory.figuratively

• The home side won in a runaway.

Having run away; escaped; fugitive; fleeting.not-comparable

• a runaway thief

Having run away; escaped; fugitive; fleeting.; Having escaped from the control of the rider or driver.not-comparable

• a runaway donkey

Having run away; escaped; fugitive; fleeting.; Pertaining to or accomplished by running away or eloping.not-comparable

• a runaway marriage

Easily won, as a contest.not-comparable

• a runaway victory at the polls

Accelerating out of control.not-comparable

• a runaway train
• a runaway greenhouse effect

Unchecked; rampant.not-comparable

• runaway prices

Deserting or revolting against one's group, duties, expected conduct, or the like, especially to establish or join a rival group, change one's life drastically, etc.informalnot-comparable

• The runaway delegates nominated their own candidate.