changing of the guard

Noun

broadly figuratively

(usually preceded by the) A ceremony during which the soldiers or other officials guarding a major government building or state residence, especially Buckingham Palace in England, are replaced by a new shift.

Japanese Meaning

国の重要な施設や国家元首の官邸などを守る兵士などが、新しい班に交代するために行われる公式な儀式、すなわち『衛兵交代式』を意味する。

What is this buttons?

Tourists gathered in the courtyard to watch the changing of the guard outside Buckingham Palace.

Google Translation / DeepL Translation

観光客は中庭に集まり、バッキンガム宮殿前で行われる衛兵交代式を見物した。

Details

Sense（1）

Sense（2）

(figuratively, by extension) Any situation in which an individual or group charged with a task or responsibilities in an organization is replaced by another individual or group.