ㄑㄧˊㄎㄞㄉㄜˊㄕㄥˋqíkāi‑déshèng

旗开得胜
  1. 軍旗展開取得勝利比喻首戰告捷事情開始便取得成績 世界足球地主隊旗開得勝」。

lit. to win a victory on raising the flag (idiom)​; fig. to start on sth and have immediate success, success in a single move
Wavin' Flag