切齿

切齿	qiè chǐ	to gnash one's teeth (in anger)
切	qiē	to cut; to slice; to carve / (math) tangential
切	qiè	definitely; absolutely (not) / (scoffing or dismissive interjection) Yeah, right.; Tut! / to grind / (bound form) close to / (bound form) eager / to correspond to / (used to indicate that the fanqie 反切 system should be applied to the previous two characters)
齿	chǐ	tooth / CL:颗