Kicking one's heels is an idiom that means waiting idly, usually for something or someone. Some antonyms for this phrase could include being productive, active, or engaged in something. If someone is not kicking their heels, they might be occupied, attentive, or focused on a task or activity. Other antonym options could include being efficient, proactive, or busy with various responsibilities or commitments. The opposite of kicking one's heels would ultimately involve taking action and making the most of one's time, rather than wasting away in indecision or boredom.
