To walk or step on something. Be careful not to tread on the flowers in the garden.
To press down or crush with the feet. The grapes were traditionally trodden to make wine.
To follow a path or course. He decided to tread a new path in his career.
To proceed or act in a particular way. She had to tread carefully when discussing the sensitive topic.
To keep the body upright and stay afloat in water by moving the arms and legs. She could tread water for several minutes without tiring.