尖嘴嚼舌jiān zuǐ jiáo shé

have a very sharp tongue
❍ 再说电话所那帮女电话员，～的，老拿她和吴天宝取笑，也叫她受不了。(杨朔《三千里江山》14) What is more,those girls at the telephone office had very sharp tongues; to her dismay,they liked to make fun of her and Tianbao.