Godan verb with 'ru' ending, Intransitive verb
to lash out at; to flare up at; to fly at; to turn on
あの野暮ったい服を幾らで買ったのかと聞いただけで、彼女は逆上して私にくってかかってきた。I only asked her what she paid for that dull-looking dress and she flew off the handle at me.
Also written 食って掛かる【くってかかる】