All 5 Uses of

couplet
in
The Iliad by Homer - (translated by: Edward)

Numerous as have been the translators of the Iliad, or of parts of it, the metres which have been selected have been almost as various: the ordinary couplet in rhyme, the Spenserian stanza, the Trochaic or Ballad metre, all have had their partisans, even to that "pestilent heresy" of the so-called English Hexameter; a metre wholly repugnant to the genius of our language; which can only be pressed into the service by a violation of every rule of prosody; and of which, notwithstanding my respect for the eminent men who have attempted to naturalize it, I could never read ten lines without being irresistibly reminded of Canning's "Dactylics call'st thou them?†
Chpt Pref.

couplet = two successive lines of poetry; usually rhymed

I have seen isolated passages admirably rendered in other metres; and there are many instances in which a translation line for line and couplet for couplet naturally suggests itself, and in which it is sometimes difficult to avoid an involuntary rhyme; but the blank verse appears to me the only metre capable of adapting itself to all the gradations, if I may use the term, of the Homeric style; from the finished poetry of the numerous similes, in which every touch is nature, and nothing is overcoloured or exaggerated, down to the simple, almost homely, style of some portions of the narrative.†
Chpt Pref.

I have seen isolated passages admirably rendered in other metres; and there are many instances in which a translation line for line and couplet for couplet naturally suggests itself, and in which it is sometimes difficult to avoid an involuntary rhyme; but the blank verse appears to me the only metre capable of adapting itself to all the gradations, if I may use the term, of the Homeric style; from the finished poetry of the numerous similes, in which every touch is nature, and nothing is overcoloured or exaggerated, down to the simple, almost homely, style of some portions of the narrative.†
Chpt Pref.

To subject these to the trammels of couplet and rhyme would be as destructive of their chief characteristics, as the application of a similar process to the Paradise Lost of Milton, or the tragedies of Shakespeare; the effect indeed may be seen by comparing, with some of the noblest speeches of the latter, the few couplets which he seems to have considered himself bound by custom to tack on to their close, at the end of a scene or an act.†
Chpt Pref.

To subject these to the trammels of couplet and rhyme would be as destructive of their chief characteristics, as the application of a similar process to the Paradise Lost of Milton, or the tragedies of Shakespeare; the effect indeed may be seen by comparing, with some of the noblest speeches of the latter, the few couplets which he seems to have considered himself bound by custom to tack on to their close, at the end of a scene or an act.†
Chpt Pref. *

couplets = successive pairs of lines of poetry; usually rhymed

Definition:

poetry: two successive lines of verse; usually rhymed