It take some research, "use google" - A soldier should aways take and use cover, but the word and the answer has more depth. And like all answers there are several variations.
Here is some examples
Sergeant Horvath:"
We're in business! Defilade! Other side of the hole!"
Go to this site and listen to one example, here Sgt Horvath uses the phrase.
http://www.moviesoundclips.net/sound.php?id=91
This has come up before
I was watching saving private ryan and in the movie on omaha they say the word "defilade", in the sentence "
That should give you complete defilade from that machine position"
Here is an example outside of the movie
Even simple things like how to Flank an enemy position, or setting up defilade and enfilade fire would be useful.
One Day in War: Don Malarkey and the 101st Screaming Eagles
Malarkey crawled up to a hedge, pushed his way through the vegetation, and peered through. Not far in front of him he saw the outline of one of the 105’s dug in well under heavy camouflage netting. Winters had scratched together a plan and it was time to get into the war. In an orchard just outside of Brecourt, Winters ordered each man to line up and spray four clips into the general area of the gun positions. As the men fired away, Winters ordered Malarkey to cross the field to set up a defilade position. Taking a deep breath, Malarkey got ready to run. Just then the gravelly voice of Sgt. Buck Compton called him back. Compton makes the run himself, disappearing through the dense underbrush. Now the sixty man German garrison is alert and returning fire in all directions.