Active phase arrest is a medical term used to describe the cessation of cervical dilation and effacement during a woman's labor. This often occurs when the baby's head is unable to descend further into the pelvis due to maternal or fetal reasons. Synonyms for active phase arrest include: prolonged labor, stalled labor, cervical dystocia, labor arrest, prolonged second stage of labor, dysfunctional labor, obstructed labor, and failure to progress. It is important for medical professionals to identify and address active phase arrest promptly as it may lead to further complications such as fetal distress and the need for assisted delivery. Early intervention can ensure a safe and healthy delivery for both mother and baby.