The term "shake leg" is commonly used in colloquial language to mean moving one's body in a rhythmic and energetic manner. However, if we were to think of antonyms for this phrase, words like still, stationary, and stagnant come to mind. These words would imply a lack of movement or stillness in the body, rather than the energy often associated with shaking a leg. Alternatively, one could also use words such as sit, relax, and rest as antonyms for shake leg, as they suggest a more passive state of being, rather than an active or energetic one.