"Tote up" is a phrasal verb means to add up or calculate a total. Antonyms for this word can be "subtract," "deduct," "remove," or "reduce." These words all have the opposite meaning of "tote up" as they involve taking away or decreasing something instead of adding it up. For instance, if you need to find the difference between two numbers, you would subtract them instead of totting them up. Similarly, if you want to decrease the total amount of something, you would remove or reduce it, which is the opposite of totting up the total.