Plug in and Tie-up

Plug in verb - Plug into an outlet.

Tie-up and plug in are semantically related. in link topic. In some cases you can use "Tie-up" instead a noun "Plug in", when it comes to topics like connection.

Tie-up noun - A crowded mass (as of cars) that impedes or blocks movement.

Plug in and tie-up are semantically related. Sometimes you can replace term "Plug in" with "Tie-up", this terms are similar.