flag-off
noun /ˈflæɡ ɒf/
  /ˈflæɡ ɔːf/
(Indian English, West African English)- the official start of an event标记:事件的正式开始 - Thousands of people attended the flag-off in the capital city.成千上万的人参加了首都的闭幕式。 
 
- Thousands of people attended the flag-off in the capital city.