1. link up - Noun
2. link up - Verb
make a logical or causal connection
connect, fasten, or put together two or more pieces
be or become joined or united or linked
Source: WordNetlink-up
I cannot connect these two pieces of evidence in my mind Source: Internet
colligate these facts Source: Internet
I cannot relate these events at all Source: Internet
Can you connect the two loudspeakers? Source: Internet
Tie the ropes together Source: Internet
Link arms Source: Internet