"Run for the hills" is a popular idiom that often suggests an immediate and urgent need to escape from a dangerous, challenging, or stressful situation. There are several synonyms that can be used to express the same idea, such as "hightail it," "beat a retreat," "make a run for it," "take to one's heels," and "scram." Each of these figurative expressions implies a sense of haste, urgency, and fear that motivates individuals to flee or seek refuge from a potential threat or danger. While they may differ in their tone and connotation, these synonyms all convey a similar message of urgency and the need for quick action to stay safe.