Knocking back is a phrasal verb that means to drink alcohol quickly or to reject or refuse something. Its antonyms, or words with opposite meanings, include sipping, indulging, accepting, welcoming, agreeing, and approving. Instead of knocking back a drink, one could sip it slowly, savouring its flavour. Similarly, instead of rejecting or refusing an offer or proposal, one could accept it eagerly or welcome it with open arms. The opposite of knocking back is often associated with moderation, cooperation, and positivity, the qualities that can lead to a more balanced and fulfilling life.