A couplet is two lines of poetic verse that present a single concept or idea. The lines usually rhyme and have the same meter. A good example is the following conclusion to a sonnet by Edna St. Vincent Millay: | A couplet is two lines of poetic verse that present a single concept or idea. The lines usually rhyme and have the same meter. A good example is the following conclusion to a sonnet by Edna St. Vincent Millay: |