齧齒 [啮齿]

Jyutping nget6 ci2
Pinyin niè chǐ

Definitions (Wiktionary)
  1. verb, literary
    to gnash one's teeth
  2. verb, figuratively, literary
    to be in extreme anger; to be fuming with rage with gritted teeth
  3. adj, attributive
    relating to rodents