The last syllable or two of a line is repeated.
Sometimes spelling or meaning may change.
Echo usually indented to a point under of behind the syllable it mimics.
Echo functions as an independent line of 1 or 2 syllables.
Ironic (meaning of echo conflicting with original)
Affirmation (echoing the meaning to validate it)
Usually in the form of a dialogue/question and answer format
Similar to Rime Riche – (type of echo where rhyme words are pronounced or spelled the same)