Cuckoo spit , ∨ Cuckoo spittle Meaning, Definition & Usage

Definitions
  1. . (a) A frothy secretion found upon plants, exuded by the larvae of certain insects, for concealment; called also toad spittle and frog spit. (b) (Zoöl.) A small hemipterous insect, the larva of which, living on grass and the leaves of plants, exudes this secretion. The insects belong to Aphrophora, Helochara, and allied genera.

Webster 1913