嗑kè

 （用上下门牙咬有壳的或硬的东西） crack sth. between the teeth: ～ 瓜子儿 crack melon seeds; 这所老房子里的一些家具已经被老鼠 ～ 坏了。 Some of the furniture in this old house has been gnawed away by rats.
另见 see also kē。