There are several antonyms for the expression "dead one's feet," which refers to feet that are numb or have fallen asleep due to poor circulation or too much pressure. The opposite of dead feet would be lively or vibrant feet, which are full of energy and vitality. Other antonyms include agile, nimble, quick, spry, and swift feet. These terms describe feet that are strong, flexible, and capable of powerful movements, such as running, jumping, or dancing. By contrast, dead feet convey a sense of lifelessness or immobility, as though they are detached from the rest of the body. To avoid experiencing dead feet, it is important to move frequently, stretch regularly, and wear comfortable shoes.