link up in WordNet English dictionary

1. 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"
   associate  tie in  relate  link  colligate  link up  connect 
   
2. connect, fasten, or put together two or more pieces
   "Can you connect the two loudspeakers?"; "Tie the ropes together"; "Link arms"
   connect  link  tie  link up 
   
3. 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"
   connect  link  link up  join  unite