[cross.over] n (1884) 1: crossing 2a
2: an instance or product of genetic crossing-over
3: a voter registered as a member of one political party who votes in the primary of the other party
4: a broadening of the popular appeal of an artist (as a musician) or an artist's work that is often the result of a change of the artist's medium or style; also: an artist or artistic work that has achieved a crossover
5: an instance of breaking into another category "trying to make the ~ to serious acting --Michael Neill"
[2]crossover adj (1893) 1: having two pieces that cross esp. one over the other "a ~ vest"
2: critical 1 "the ~ point"