Distich

A couplet is a pair of lines of metre in poetry. A couplet usually consists of two lines that rhyme and have the same metre. A couplet may be formal (closed) or run-on (open). In a formal (or closed) couplet, each of the two lines is end-stopped, implying that there is a grammatical pause at the end of a line of verse. In a run-on (or open) couplet, the meaning of the first line continues to the second.

The word "couplet" comes from the French word meaning "two pieces of iron riveted or hinged together." The term "couplet" was first used to describe successive lines of verse in Sir P. Sidney's Arcadia in 1590: "In singing some short coplets, whereto the one halfe beginning, the other halfe should answere."

While couplets traditionally rhyme, not all do. Poems may use white space to mark out couplets if they do not rhyme. Couplets in iambic pentameter are called heroic couplets. John Dryden in the 16–17th century and Alexander Pope in the 18th century were both well known for their writing in heroic couplets. The Poetic epigram is also in the couplet form. Couplets can also appear as part of more complex rhyme schemes, such as sonnets.

Rhyming couplets are one of the simplest rhyme schemes in poetry. Because the rhyme comes so quickly, it tends to call attention to itself. Good rhyming couplets tend to "explode" as both the rhyme and the idea come to a quick close in two lines. Here are some examples of rhyming couplets where the sense as well as the sound "rhymes":

On the other hand, because rhyming couplets have such a predictable rhyme scheme, they can feel artificial and plodding. Here is a Pope parody of the predictable rhymes of his era:

Rhyming couplets are often used in Early Modern English poetry, as seen in Chaucer's The Canterbury Tales. This work of literature is written almost entirely in rhyming couplets. Similarly, Shakespearean sonnets often employ rhyming couplets at the end to emphasize the theme. Take one of Shakespeare's most famous sonnets, Sonnet 18, for example (the rhyming couplet is shown in italics):

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