What is the repetition of words or phrases at end successive sentences?

The repetition of words or phrases at the end of successive sentences is called anaphora.

Here's an example:

"We shall not fail. We shall not falter. We shall not yield." - Winston Churchill

In this example, the phrase "We shall not" is repeated at the beginning of each sentence, creating a powerful and memorable effect.

Anaphora is a common rhetorical device used to emphasize a point, create rhythm, and build momentum in writing and speech.