1.a clip or clamp used in rock climbing or ice climbing that runs freely up a slack rope but tightens around the rope in response to weight applied from below
1.to climb using jumar clamps
器
...锁活扣(Locking Carabiner)、攀绳器 (Jumars)、绳梯 (Aiders)、头盔、吊床及雨篷 (Portaledge and Rainfly)、吊袋 (Haul Bag) …