what people mean by what they say is everything

what people mean by what they say is everything People don't say exactly what they mean. But what do people mean by mean? people also don't say exactly what they mean?这是什么从句啊,(请说明原因) MEAN WHAT IS MEAN what is your mean by saying that? what do you mean by say that 的by say that是什么成分 what do you mean that a by say b through say c by saying d t say what you mean,mean what you say just say what you mean,and mean what you say. i mean what i say I do not know what you mean to say is,