The phrase "takes wind out of sails" means to deflate or diminish someone's enthusiasm, confidence or momentum. Its antonyms would be words or phrases that indicate an increase in energy or enthusiasm. Some antonyms for "takes wind out of sails" could be: to ignite passion, to fuel motivation, to propel forward, to inspire hope, to uplift spirits, to raise morale, to energize and to stimulate growth. These antonyms convey a sense of positivity and optimism which can help in increasing one's motivation and confidence, making it easier to face challenges head-on. In short, the phrase "takes wind out of sails" may be negative, but its antonyms offer positive ways to deal with setbacks and challenges.