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Meaning of cuckoo-spit

cuck•oo-spit

Pronunciation: (k'k-spit", kook'-), [key]
— n.
  1. Also calleda frothy secretion found on plants, exuded by the young of certain insects, as the froghoppers, and serving as a protective covering.
  2. an insect that produces this secretion.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.