单词open-one-s-mouth
It is better to stay silent and be thought a fool, than to open one"s mouth and remove all doubt.
宁愿保持沉默让人看起来像个傻子，也不要一开口就证明自己确实如此。
Most afraid of is that the person has not even too lazy to open one"s mouth of the quarrel.
最害怕的，就是那个人，已经连争吵都懒得张口了。