ˌcross-ˈtraining BrE AmE noun [uncountable]
1 . an exercise programme that includes many different kinds of exercise, so that all of your muscles are used
2 . when people in a company learn about each other’s jobs, so that they understand each other better and work together better as a team:
Cross-training is a vital part of job rotation.
—cross-train verb [intransitive]