Swim/swɪm/ Definition 1 of 6Pro Tip 1/3Physical Movement Swim involves actual physical movements in water, usually with arms and legs. To stay afloat, you need to keep swimming. Pro Tip 2/3Solo or Groups Swimming can be done alone or as part of a group, like in races or synchronized swimming. The team swam in perfect harmony. Pro Tip 3/3Requires Skill Being able to swim requires learning and practice. It's not an innate ability in humans. She took lessons to learn how to swim.