cou·plet /ˈkʌplət/
  對句,對聯
  Coup·let n.  Two taken together; a pair or couple; especially two lines of verse that rhyme with each other.
     A sudden couplet rushes on your mind.   --Crabbe.
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  couplet
       n 1: two items of the same kind [syn: couple, pair, twosome,
             twain, brace, span, yoke, distich, duo, duet,
             dyad, duad]
       2: a stanza consisting of two successive lines of verse;
          usually rhymed