伶牙俐齿

伶牙俐齿	líng yá lì chǐ	clever and eloquent (idiom); fluent / having the gift of the gab
伶	líng	(old) actor; actress / (meaningless bound form)
牙	yá	tooth / ivory / CL:颗
俐	lì	used in 伶俐
齿	chǐ	tooth / CL:颗