What is the repetition of a line or group lines throughout poem?

The repetition of a line or group of lines throughout a poem is called a refrain.

Here's a breakdown:

* Refrains are often used in songs and poems to emphasize a particular idea, emotion, or theme.

* They can appear at the end of a stanza, at the beginning of a stanza, or even within a stanza.

* Sometimes, a refrain might change slightly each time it appears, adding a layer of complexity to the poem.

Let me know if you'd like examples of refrains in poems!