to oppose each other with equal harshness (idiom); tit for tat
measure for measure
Definitions (粵典–words.hk)
語句
比喻雙方嘅勢力、行為、言辭等尖鋭對立,不相上下 to be diametrically opposed to; to stand in sharp opposition
佢兩個成日針鋒相對,從來都唔打算和解。
佢两个成日针锋相对,从来都唔打算和解。
keoi5 loeng5 go3 sing4 jat6 zam1 fung1 soeng1 deoi3, cung4 loi4 dou1 m4 daa2 syun3 wo4 gaai2. They are always standing in sharp opposition to each other, and neither side is prepared to compromise.
Definitions (Wiktionary)
phrase, idiomatic
to be diametrically opposed; to be in sharp opposition; to go toe-to-toe with somebody in action or speech; to give tit for tat