Wiktionary
vb. 1 (context transitive English) to tie up using a rope. 2 (context intransitive English) to attach oneself to a rope
WordNet
v. attach to one another, for safety; "The mountaineers roped up when they started the final ascent"
Usage examples of "rope up".
When I get the rope up I'll pass it over a rail and secure it to Van Effen.
Mosovich said, picking the rope up and slipping it under his thigh.
And whoever held the other end of the rope up above was moving even as quickly as I was, for the rope tightened just as I finished tying the knot.
Twice Andrea jerked the rope up a foot or two, let it fall again: the weightless rope swayed wildly in the wind.
Only one man at a time could work at this, straddling the well head and pulling the rope up hand over hand.
The young mouse threw a rope up to the creatures balanced on the end of the rowan.