Noun
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a path (often marked) where something (as a street or railroad) can be crossed to get from one side to the other
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the appropriation of a new style (especially in popular music) by combining elements of different genres in order to appeal to a wider audience
"a jazz-classical crossover album"
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a voter who is registered as a member of one political party but who votes in the primary of another party
- crossover voter -
the interchange of sections between pairing homologous chromosomes during the prophase of meiosis
- crossing over