"Cable crossovers" refer to a type of exercise where you use a cable machine to work different muscle groups in your body, typically your chest and arms. Full definition
If you're doing cable crossovers, for best contractions cross your hands with one going over the other. (fitnessandpower.com)
Then, he does a superset of cable crossovers and chest dips until he reaches muscle failure. (fitnessandpower.com)
For this finisher you'll need to set the machine fly, incline hammer strength machine, incline smith machine and cable crossover machine to a moderate weight, then perform one set of 12 reps at each machine, performing pushups to failure between each set. (fitnessandpower.com)