"Two lines of verse, usually in the same meter and joined by rhyme, that form a unit." Couplets, by definition, always rhyme. Otherwise, they are simply paired lines that may be of the same length and meter: for example, iambic pentameter lines are all 10 syllables, but not necessarily rhymed.

P.S. This has been fun and a great escape from all the dismal political news.

It has, thank you!

Source? A pair of unrhymed lines of verse would never be called a couplet in any traditional sense. I suppose that current criticism has allowed the term to apply to a set of even length, paired lines set off from the rest of the poem. No professor I ever had for 3 degrees in English would say so.

Oxford languages.

Shucks, my definition comes from Cambridge University. 😉

🤣😂🤣