Weight bearing
In exercise, weight bearing usually means supporting your body against gravity through your feet and legs. In rehabilitation instructions, it can describe how much weight you are allowed to put through an injured or operated limb.
In everyday words
Walking is a weight-bearing activity. Swimming supports much of your body weight in water, so it is not usually described as weight-bearing exercise.
What to keep in mind
After an injury or surgery, instructions such as partial or non-weight bearing have a specific purpose. Follow the limits given by your care team and ask them to explain anything unclear.