Echo Verse is a poem in which the last syllable or two of a main line is repeated, perhaps with different spelling or meaning, as if an echo.
Usually this echo will be indented to a point under or beyond the syllable it mimics and will function as an independent line of one or two syllables.
Sometimes the word 'echo' will precede the repetition, like identifying the speaker in a play. Echo Verse can often serve an ironic purpose, the meaning of the echo conflicting with what the original sound means. For example, 'know' echoed by 'no'. On the other hand an echo poem can be used simply as another kind of rhyme.
The echo is indicated in italics to highlight the echoing word following it - this does not need to be done in your final version.
By George Herbert (1593-1633)