必殺技 [－杀－]

Jyutping bit1 saat3 gei6
Pinyin bì shā jì

Definitions (CC-CANTO)
  1. noun; killer technique; surefire assassination method, normally used in a game, which describes a special, unique skill to win the game
Definitions (粵典–words.hk)
  1. 名詞
    好​勁​嘅​招式​，​用​咗​就​一定​能夠​成功
    ultimate technique
  2. 近義詞
    殺手鐧
Definitions (Wiktionary)
  1. noun
    fighter's finishing move; ultimate technique