The phrase "turns thumbs down" means to reject, disapprove or oppose something. Its antonyms include "approves", "accepts", "supports", "endorses" and "agrees". Approving of something means to give permission, consent or sanction to it. On the other hand, accepting something is to acknowledge, receive or recognize it as valid or true. Supporting something means to provide assistance, backing or encouragement to it. Similarly, endorsing something is to publicly give approval or support to it. Finally, agreeing with something means to share the same opinion, idea or view as it. Therefore, these antonyms can be used to express positive or favorable responses to something, in contrast to turning thumbs down which portrays negativity or disapproval.