couplet

Definition: a pair of successive lines of verse, especially a pair that rhyme an are the same length.


Example:
Little Billy Critter sat his arse upon a flat,

Singing a little song, petting a little cat.
The cat decided it should not be petted anymore,

Decapitated Billy, and left him on the floor.
Kinda sad that he killed the boy,

Not for long because he found a toy.
It was round, bouncy, and very red

Much more fun than Billy's head
He bounced it up and down the street

'Til another little boy did he meet
The new little boy's name was Jay

He took the little red ball and ran away.

Significance: Poets often choose couplets to make their poem funny and more interesting to read.