sudden thrust (that catches the opponent off guard)
Definitions (粵典–words.hk)
名詞
比喻一啲冇提防嘅反擊,或去而復返嘅二次攻擊 analogy of an unexpected counter strike, or the second strike after the first round; literally: return horse spear
個颱風竟然識回馬槍,仲一次勁過一次。
个台风竟然识回马枪,仲一次劲过一次。
go3 toi4 fung1 ging2 jin4 sik1 wui4 maa5 coeng1, zung6 jat1 ci3 ging6 gwo3 jat1 ci3. It's surprising that the typhoon can make a second strike, even getting stronger.
Definitions (Wiktionary)
noun
a sudden returning (to the previous location, or resuming a previous progress)
noun, in historical fictions
a surprise counterattack performed by a retreating cavalryman