Rhopalic verse is verse arranged so that each successive word, phrase, or line grows longer by a regular pattern, usually by one syllable or one metrical unit at a time. The most common sense in English is a line built from words that increase step by step in length, creating a neatly expanding shape of sound and rhythm.
Because the term has been used in more than one way, readers sometimes need to check the exact pattern a particular writer intended.
Example
I
am
brave
and
steady
through
stormy
weather