Wiktionary
vb. (present participle of join up English)
Usage examples of "joining up".
Isn't it true he was joining up with those two jokers, Smuggler Yuen and White Powder Lee?
And as Praxis and the Swiss and their allies worldwide had thrown all their resources into refugee aid and the longevity treatments, people everywhere were joining up.
As it only required attendance at weekends and for two weeks' annual camp per year, joining up would not oblige me to leave the job that paid my bills.
Salmon told me that he'd heard the best barrows were being sold off in the Old Kent Road, on account of the fact that so many young lads were heeding Kitchener's cry and joining up to fight for King and country.
Couldn't we sort of say that there's a King or something in Nahgharash who wants to take over the whole world and that he's managed to talk the silly fellow in Kanthon into joining up with him?
And joining up with your route from inside the hospital is out, too.