白金汉宫皇家卫队换岗(仪式)a ceremony in which a group of soldiers replaces the soldiers who have finished their time on duty standing outside an important public building, such as a palace (= a building where a king or queen lives)
The band played the national anthem during the changing of the guard.
I hope to get to Buckingham Palace in time to see the changing of the guard.
There was a special changing of the guard ceremony today to honour victims of the attacks.
Synonym: guard mount
See also: guard noun (PERSON WHO PROTECTS)