1
general::
Also, over and over again. Repeatedly, many times, as in I've told you over and over that he can't eat spicy food. [Late 1500s] Also see AGAIN AND AGAIN.
American Heritage Idioms
2
general::
Phrase(s): over and over (again)
repeatedly. • She stamped her foot over and over again. • Bill whistled the same song over and over.
McGrawhill's American Idioms And Phrasal Verbs