What is a refrain phrase?

A refrain phrase is a phrase that repeats itself in a poem. Here is an example: There was a tree With a bumblebee It awfully stung me WHY DEOS IT HAVE TO BE ME There was a truck About to hit a tree Instead it hit me then a duck WHY DEOS IT HAVE TO BE ME In these cases, why DEOS it have to be me is the refrain. Sorry about the awful poetry, made them up right on the spot, but it still shows the refrain. Hope this helped!!