I am not entirely clear what your question is. If you are asking "what is a COD" then here is the answer:
COD stands for Complément d'Objet Direct, i.e., a direct object to the verb. It is usually something that the verb's action is directed toward. The concept of COD exists also in English. But don't be mislead: there are instances where a certain verb takes a COD in one language but not in the other. Here are a few examples of COD, with the COD highlighted:
Je mange une pomme. -- I eat an apple.
Les voisins ont acheté une nouvelle voiture. -- The neighbors bought a new car.
Here an example where the French takes a COD but the English does not.
Tu m'attends? -- Are you waiting for me?
By the way, it might be a good idea to goolge the term.
-- Chris (not a native speaker).