serjeant-at-arms
/ˈsɑːdʒəntətˈɑːmz/(亦作sergeant-at-arms)
noun
(pl. serjeants-at-arms)
1- an official of a legislative assembly whose duty includes maintaining order and security（立法会的）警卫官; 守卫官。
1.1
- Brit. historical a knight or armed officer in the service of the monarch or a lord〈英史〉为君主（或领主）服役的骑士（或军官）。