1. (verb) link, linkup, tie, tie-in
a fastener that serves to join or connect
"the walls are held together with metal links placed in the wet mortar during construction"
2. (verb) tie in
be in connection with something relevant
"This ties in closely with his earlier remarks"
3. (verb) associate, tie in, relate, link, colligate, link up, 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"
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Definitions of tie in 
