To become frenzied or to fly into a rage; to lose self-control and act violently or irrationally.
上司に厳しく叱られて、彼はつい逆上してしまった。
He was scolded harshly by his boss and ended up flying into a rage.
些細なことで逆上して暴言を吐くのは、感情のコントロールができていない証拠だ。
Flying into a rage and lashing out over trivial matters shows an inability to control one's emotions.
あの場面で逆上していたら、事態はもっと悪くなっていたかもしれない。
If he had lost his temper at that moment, the situation might have become worse.