1. a person, especially a child, who has left home without permission

1. happening very quickly and out of control
2. having left home without permission
3. achieved easily or by a large margin

Examples

• The police found the runaway teenager at the bus station.
• Runaway inflation made it difficult for families to afford basic necessities.
• The runaway horse galloped across the field.
• She won the election by a runaway margin.
• The shelter provides help for runaway youth.
• Runaway costs forced the company to cancel the project.
• The runaway success of the book surprised everyone.