There are many different synonyms for the phrase "run away." Depending on the context of the sentence, some of these synonyms may be more appropriate than others. For example, if you are talking about a criminal who has fled the scene of a crime, you might use words like "escape," "flee," or "abscond." On the other hand, if you are talking about a child who has left home without permission, you might use words like "bolt," "depart," or "absent oneself." Other synonyms for "run away" include "take flight," "run off," "make a break for it," and "absquatulate".