挂齿

挂齿	guà chǐ	to mention (e.g. "don't mention it")
挂	guà	to hang; to suspend (from a hook etc) / to hang up (the phone) / (of a line) to be dead / to be worried; to be concerned / (dialect) to make a phone call / to register (at a hospital); to make an appointment (with a doctor) / (slang) to kill; to die; to be finished; to fail (an exam) / classifier for sets or clusters of objects
齿	chǐ	tooth / CL:颗