Swimming is an activity that involves moving through the water using your arms and legs. One of the best ways to cool off on a hot summer day is swimming in a cold lake or pool.
Swimming is both a casual activity and a serious sport. To you, swimming may involve splashing through the waves or dog-paddling across a public pool. Olympic athletes, on the other hand, swim distances as far as 1500 meters at unbelievable speeds. As an adjective, swimming describes anything that swims or that's used for swimming, like a swimming hole. You can also poetically describe a crying person's eyes as "swimming with tears."