Thumbs down is a commonly used gesture that indicates disapproval or negative feedback. However, there are several antonyms for the phrase that convey positive feedback and approval. The most common antonym for thumbs down is thumbs up which indicates approval and is a symbol for positivity. Other antonyms include well played, well done, fantastic, excellent or great job, all of which convey a sense of admiration and appreciation for the work done. In addition, other positive expressions such as bravo, good show, and congratulations can also serve as antonyms for thumbs down. Overall, using positive language and gestures can promote an encouraging and supportive environment.