"Didst number on" is not a word nor phrase in the English language. Therefore, there are no antonyms for it. However, the words "did" and "number" do exist independently of each other, and each has its own antonyms.
The antonym for "did" is "did not" or "didnt". It means the opposite of doing something or not taking action. Meanwhile, the antonym for "number" could be "unnumbered" or "uncounted," which is a word that describes something that has not been given a numerical value. For example, an unnumbered page is a page in a book without a page number.
Overall, it is important to use correct phrases and words when trying to find their antonyms.