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1 [with object] fertilize (a plant) using pollen from another plant of the same species: he cross-fertilized some batches of plants
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[no object] (of two plants) fertilize each other: fennel should not be grown near to dill, otherwise the two will cross-fertilize
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2stimulate the development of (something) with an exchange of ideas or information: sessions between the two groups cross-fertilize ideas and provide insights
