Here's the breakdown:
* Refrain: A phrase, line, or group of lines that is repeated at regular intervals in a poem or song. It acts as a unifying element, adding emphasis and musicality.
* Figure of speech: A word or phrase used in a non-literal way to create a particular effect. Examples include metaphors, similes, personification, etc.
Example of a refrain:
"Row, row, row your boat,
Gently down the stream.
Merrily, merrily, merrily, merrily,
Life is but a dream."
The lines "Row, row, row your boat" and "Merrily, merrily, merrily, merrily" are the refrains in this song.
Let me know if you have any other questions!