Took oath is a phrase that refers to the act of making a formal, often solemn promise or pledge. Antonyms, on the other hand, are words that have opposite meanings to a given word. Therefore, antonyms for took oath would include phrases such as "broke promise," "refused pledge," "dishonored commitment," "violated vow," or "disavowed oath." These phrases indicate a failure to uphold a promise or commitment either by choice or by circumstance. They highlight the importance of maintaining one's integrity and keeping one's word, as taking an oath involves a significant level of responsibility and accountability.