The opposite of "giving thumbs down to" would be "giving thumbs up to". Thumbs up signifies approval, support or acceptance. It is the action of raising one's thumb in the air to indicate affirmative sentiment. In contrast, thumbs down signals disapproval, disfavor, or rejection. It is the motion of turning one's thumb downwards to signal a negative response. Thumbs up is commonly used to denote liking or enjoying something, whereas thumbs down indicates a dislike or dissatisfaction with something. Rejecting, disapproving and belittling are some other antonyms for giving thumbs up to.