elope

1a :  to run away secretly with the intention of getting married usually without parental consent … Waterman was a peevish child who grew into a defiant teenager, eloped at 18 largely to shock his father, and then—far too young—was a father himself. — Elizabeth Gilbertb :  to run away from one's husband with a lover “ … when they had been married nearly seven years, and were within a few weeks of the time when the brother's death would have adjusted all, she eloped with a younger man, and left him.” — Charles Dickens

2 :  to slip away :  escape … might have mistaken him for … some scarecrow eloped from a cornfield. — Washington Irving