Definition of "porpoising" []

• Present participle of porpoise. (verb)

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• "They are shown travelling in schools, porpoising from the waves, and smoothly powering themselves beneath the surface with their forked, shark-like tails."
• "This is commonly referred to as "porpoising" - think of how a porpoise or dolphin comes up just below the surface and then rolls just beneath, only breaking the surface with their dorsal fin or tail."
• "Swimming often includes porpoising (repeatedly breaking the water's surface with enough momentum to lift the bird into the air for about one meter), which may be carried out for reasons of speed, escaping predators or even purely to aid breathing (and possibly a combination of these factors)."