descant
US /ˈdes.kænt/
UK /ˈdes.kænt/
1.
an independent treble melody sung or played above a basic melody
:
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The choir added a beautiful descant to the hymn.
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Her clear voice soared above the melody, creating a lovely descant.
1.
to talk or write at length or in detail on a particular topic
:
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He could descant for hours on the history of jazz.
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The professor began to descant on the philosophical implications of the discovery.