(noun) the running over of a sentence from one verse or couplet into another so that closely related words fall in different lines
stuff like line breaks, enjambment, formal rhyme- or metrical schemes, etc
on the definition of a prose poem (i.e., based on what it lacks)
In poetry, this failure to stop at the end of the line, this challenge to metrical closure, this desire to get more in, is called enjambment.