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...a rhyming couplet. If the first syllable of each line is stressed, it's a 'heroic' rhyming couplet.
The last couplet.
a sentence with couplet in it
a rhyming couplet that contrasts or has an opposite.
"Be you his eunuch, and your mute I'll be;When my tongue blabs, then let mine eyes not see." (Act 1 Scene 2)