Strong's Concordance G5149

Original Word: τρίζω
Transliteration: trízō
Phonetic Spelling: trid'-zo
[τρίζω] apparently a primary verb; to creak (squeak), i.e. (by analogy) to grate the teeth (in frenzy)

Usages throughout the bible

Mark 9:18 - And wheresoever he taketh him, he teareth him: and he foameth, and gnasheth G5149 with his teeth, and pineth away: and I spake to thy disciples that they should cast him out; and they could not.