Hayley教口语，“刀子嘴”用英语怎么说？

刀子嘴 From 每日学英语 00:00 01:24

 have a sharp tongue 

(also be sharp-tongued)

to be someone who often criticizes and speaks in a severe way

说话尖刻，有一张刀子嘴

Jane has a sharp tongue, so be warned.

小心点，简说话很刻薄。