n.
1.the body of laws and rules of conduct administered by military courts for the discipline, trial, and punishment of military personnel
Idiom of the Day
have an ace up one's sleeve
to have something that you can use to gain an advantage (in a card game the ace is often the most valuable card and a cheater could have an ace up his or her sleeve to use against an opponent)
I have an ace up my sleeve which should help me when I meet my boss tomorrow.