What is Court-martial ?
Court-martial is (noun) 1. a court which tries someone serving in the armed forces for offences against military discipline He was found guilty by court-martial and sentenced to imprisonment. 2. the trial of someone serving in the armed forces by the armed forces authorities The court-martial was held in the army headquarters. (NOTE: The plural is courts-martial.)(verb) to try someone who is serving in the armed forces He was court-martialled for leaving his post when the enemy attacked. (NOTE: courtmartialled. The US spelling is courtmartialed.)
source: Easier English, Student Dictionary Upper Intermediate Level