runaway /ˈɹʌnəweɪ/adjective 7noun 5forms 1 adjective7 •Having run away; escaped; fugitive; fleeting. •Accelerating out of control.These epics nearly always had runaway trains, nincompoops floundering with the controls and a collapsed bridge just ahead! — 1958 •Unchecked; rampant.runaway prices •Having escaped from the control of the rider or driver. •Easily won, as a contest. •Pertaining to or accomplished by running away or eloping. •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.The runaway delegates nominated their own candidate. noun5 •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 — 1886 •[before a noun] (figurative) An object or process that is out of control or out of equilibrium.A trim runaway can make an airplane almost impossible to fly. •(figurative) An overwhelming victory.The home side won in a runaway. •The act of running away, especially of a horse or teams. formsrunaways