[{"Bold_text": "noun", "List Items": ["any of several small, gregarious cetacean of the genus Phocoena,usually blackish above and paler beneath, and having a blunt, rounded snout, especially the common porpoise,P. phocoena,of both the North Atlantic Ocean North Atlantic Oceanand the Pacific Ocean Pacific Ocean.", "any of several small cetacean , as the common dolphin ,Delphinus delphis."]}, {"Bold_text": "verb (used without object)", "List Items": ["(of a speeding motorboat) to leap clear of the water after striking a wave.", "(of a torpedo) to appear above the surface of the water.", "to move forward with a rising and falling motion in the manner of a porpoise:The car has a tendency to porpoise when overloaded."]}]