跳绳 means 'to skip rope' or 'jump rope'. As a verb-object separable verb (离合词), the verb 跳 and the noun 绳 can be split: you can insert a time duration, frequency, or result complement between them, e.g. 跳了一分钟绳 ('skipped rope for a minute') or 跳过三次绳 ('skipped rope three times'). It also works as a noun referring to the activity or the rope itself (e.g. 一根跳绳 'a jump rope').