The phrase "gave thumbs down to" is a common phrase used to express disapproval or rejection. However, there are several antonyms that express the opposite meaning. "Gave thumbs up to" is the most common antonym, which means approving or showing enthusiasm for something. Alternatively, one can use phrases like "applauded", "endorsed", "commended", "praised", "supported" to indicate approval or positive feedback. Other antonyms that convey disapproval or rejection include "criticized", "condemned", "rebuked", "censured", "denounced", and "rejected". The context determines the appropriate antonym to use, and it's essential to choose the correct words to convey the intended meaning accurately.