What is the correct spelling crossover or cross-over?

Both "crossover" and "cross-over" are acceptable spellings, but "crossover" is the more common and preferred spelling.

* Crossover: This is the more widely used spelling, found in dictionaries and most publications.

* Cross-over: This spelling is less common and is sometimes used for emphasis or to distinguish it from other uses of "crossover."

Ultimately, the choice depends on context and personal preference. However, "crossover" is the safer and more widely recognized spelling.