The term 'DESCEND CLIFF BY ROPE' can be summarized by the word 'ABSEIL', which is a 6-letter word. Abseiling is a technique used to descend a steep incline, such as a cliff, using a rope. It is a popular activity among rock climbers and mountaineers, and is also used in caving and canyoneering. Abseiling requires the use of specialized equipment, such as a harness, carabiners, and a belay device, and is considered a dangerous activity if done without proper safety precautions.