What is the definition for recurring verse?

In poetry, the term "refrain" is used to refer to a recurring verse, phrase, or line that appears throughout a poem at patterned or regular intervals. Typically, the refrain serves as a pivotal element that reinforces a central theme, emotion, or idea within the poem. It functions as a way for the poet to emphasize a particular message and create a sense of unity and cohesion across stanzas. The repetition of the refrain adds weight and significance to its content and helps to embed the intended message in the reader's memory.