Definition of master-at-arms in English:

master-at-arms

noun

  • A naval petty officer appointed to carry out or supervise police duties on board a ship.

    • ‘As master-at-arms, he is the policeman of the ship.’
    • ‘The duties of the master-at-arms force are the same here as at any base in the world - ‘To protect and serve.’’
    • ‘Boys and girls have their own separate sections of the ship, with matrons and masters-at-arms to look after them, in addition to the educational staff.’
    • ‘The door of the small room opened, and a naval enlisted man with the markings of a master-at-arms poked his head in.’
    • ‘The master-at-arms immediately walked over toward Jack, taking out a pair of handcuffs.’

Pronunciation:

master-at-arms

/ˌmastərədˈärmz/