The antonyms for the phrase "renewing one's strength" could be draining or exhausting one's energy. People who are constantly working tirelessly without taking any breaks or rest tends to become overworked, depleted, and fatigued. Other antonyms may include weakening, deteriorating, and draining, which refer to the gradual deterioration of physical, emotional, and mental states brought about by stress, anxiety, and other life challenges. In contrast, renewing one's strength involves taking a step back, nourishing oneself, and recharging one's batteries through various means, such as exercise, meditation, or vacations. Therefore, it is essential to prioritize self-care to achieve a balanced and healthy lifestyle that will energize and renew your strength.