聩：天生耳聋，引伸为不明事理。声音很大，使耳聋的人也听得见。比喻用语言文字唤醒糊涂麻木的人，使他们清醒过来。

make a noise loud enough to rouse the deaf and awaken the unhearing;
enlighten the ignorant or the benighted through spoken or written words.