"Runaway" refers to a person who leaves or escapes from a situation or place without permission, often running away from home or a specific responsibility. Full definition
It's a gorgeous runaway success of a book filled with beautiful, Middle Eastern inspired vegetarian dishes so choosing what to cook was difficult. (hungryaustralian.com)
And sadly, the «low fat» campaign seems to be an unstoppable runaway train. (queenketo.com)
There are some standards or units of instruction that, for whatever reason, you know aren't going to be runaway hits with students. (edutopia.org)