In times of war, exhausted combat soldiers requiring brief periods to rest and recover are removed from the field of combat to a place of relative safety and security. The military term, Stand Down, is used for such an action.
Stand down, geek! Stop playing Super Mario on the front lines!
This is a Military term used to tell a subordinate to shut his pie hole.
Sgt.: Sir,I believe you are an Imbecile, Lt.
LT: You better Stand Down or I will have you standing tall before the man, Sgt.