hump back

名词 hump back:

1. an abnormal backward curve to the vertebral column
   同义词：kyphosis, humpback, hunchback
2. a person whose back is hunched because of abnormal curvature of the upper spine
   同义词：humpback, hunchback, crookback
3. large whalebone whale with long flippers noted for arching or humping its back as it dives
   同义词：humpback, humpback whale, Megaptera novaeangliae