repetition

Repetition

An instance of using a word, phrase, or clause more than once in a short passage--dwelling on a point.

example:

"A horse is a horse, of course, of course,

And no one can talk to a horse of course

That is, of course, unless the horse is the famous Mister Ed"

https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhwF5MeAr-P9JXsOQ8V1KtSlb4nqcQkJMpTZkqL5wuPjcNAEbDJ7_k-LTWYru_QA2Pn517fNExxX581hfCzPKbNT1Phek8TmWdOKZXeJYB-ykU8uV0wrw2iJ24LWl_4_9M7wUl7PYzcGOQ/s400/Repetition.bmp

http://grammar.about.com/od/rs/a/repetitionterm.htm