noun
Definition: A type of small, social marine mammal that is similar to a dolphin, known for its blunt snout and triangular dorsal fin.
Example: The porpoise swam gracefully alongside the boat, delighting the passengers.
verb
Definition: To leap or dive in a way similar to how a porpoise moves in the water, often rising and falling repeatedly.
Example: The children loved to porpoise in the waves at the beach.