The antonyms for "gives thumbs up" could vary based on the context in which it is used. In general, antonyms could be terms like "disapprove," "reject," "criticize," or "dissent." These words connote an analogous meaning, an adverse gesture or expression, that implies disfavor or disillusionment. The phrase "thumbs down" is commonly used to express disapproval or rejection, and it's seen as an antonym to "thumbs up." Other antonyms like "dismiss," "oppose," "condemn," or "negate" suggest a more critical attitude towards the subject or action being evaluated. In contrast, "gives thumbs up" implies approval, endorsement, or agreement.