Cankerworm meaning

kăngkər-wûrm
(figuratively) A corrupting or destructive force.
noun
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The larva of either of two geometrid moths (Paleacrita vernata or Alsophila pometaria), destructive to fruit and shade trees.
noun
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Any of several larvae of geometrid moths that are harmful to fruit and shade trees, esp. the spring cankerworm (Paleacrita vernata) that feeds on fruit and foliage.
noun
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Either of two caterpillars, the larvae of geometrid moths, that are destructive to fruit, buds and leaves.
noun
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Origin of cankerworm