A diver is someone who plunges into water, either for sport, work, or exploration. You've probably seen divers at a swimming pool, leaping from springboards or high platforms and performing graceful flips and twists before slicing cleanly into the water. Olympic divers train for years to perfect their form, and judges score them on how difficult their dive is and how smoothly they execute it.

But diving goes far beyond the pool. Scuba divers explore underwater worlds, breathing from air tanks strapped to their backs as they swim alongside coral reefs and shipwrecks. Pearl divers have worked for centuries, holding their breath as they plunge deep to harvest oysters from the ocean floor. Commercial divers repair underwater structures like bridges, oil rigs, and ships, sometimes working in complete darkness hundreds of feet below the surface.

The word also appears in other contexts. Scientists call certain water birds divers because they plunge beneath the surface to catch fish. When someone is described as a deep diver, it means they study or think about something thoroughly and seriously, going far beneath the surface to understand what others might miss.