In the Command and Conquer games, the engineer unit has the ability to capture enemy buildings and place hem under your control.

An engineer rush is a battle tactic where you send a fuckload of engineers into an enemy base and try to capture useful or expensive buildings.
I got his construction yard and weapon factory with an engineer rush. The rest was easy.
by Darth Ridley February 17, 2007
Get the engineer rush mug.