Answer:
Repetition.
Step-by-step explanation:
If you repeat a word or a line in poetry, then that word or line (or those words or lines) appears to be more important than other parts of the poem. In fact, in a poem with repeating lines, all of the other lines are often comments on or elaborations of the repeated line. Repetition can also affect the rhythm of a poem and the way it sounds.
You're welcome. Have a nice day!