The term "knocks for a loop" is an idiom that describes someone who has been stunned or shocked by something unexpected. Antonyms for this phrase could include words and phrases that denote feeling calm or in control. For example, "calm and composed," "unruffled," "unperturbed," "unshaken," "unfazed," and "poised" could all be considered antonyms for "knocks for a loop." Other antonyms could include words that describe feeling prepared or forewarned, such as "anticipating," "expecting," "proactively ready," and "prepared." Ultimately, the antonyms for "knocks for a loop" all point towards a sense of preparedness and composure in the face of unexpected events.