link up

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, fasten, or put together two or more pieces

• “Can you connect the two loudspeakers?”
• “Tie the ropes together”
• “Link arms”

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”