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Douglas Harper's Etymology Dictionary
cross-over

also crossover, 1795, as a noun, a term in textiles, from the verbal phrase; see cross (v.) + over (adv.). From 1884 in railroading; from 1912 in biology. As a general adjective from 1893; specifically of musicians and genres from 1971.

Wiktionary
cross-over

n. (alternative spelling of cross over English)

Usage examples of "cross-over".

Their jackets were naval monkey jackets, or cavalry tunics, or cross-over leather flying coats, but every one of them wore the embroidered RFC wings on his breast.