If one thing is linked up to another, the two things are connected to each other. The television screens of the next century will be linked up to an emerging world telecommunications grid. = connect
make a logical or causal connection; "I cannot connect these two pieces of evidence in my mind"; "colligate these facts"; "I cannot relate these events at all"
be or become joined or united or linked; "The two streets connect to become a highway"; "Our paths joined"; "The travelers linked up again at the airport"
If you link up with someone, you join them for a particular purpose. They linked up with a series of local anti-nuclear and anti-apartheid groups The Russian and American armies linked up for the first time on the banks of the river Elbe. = join up