1to reveal (indirectly, implicitly)
2to show (interest, contempt etc) by means of one's actions, tone of voice etc
Examples
bú yào不要liú lù流露nǐ你de的gǎn qíng感情。
不要流露你的感情。
Don't let your feelings show.
任何情绪，只要它是真诚的，就说明它是发自内心的自然流露。
Any emotion, if it is sincere, is involuntary.
简单来说，他的文笔并没有流露出那种对自己的论文充满信心的人应有的直率和坦诚。
He does not, in short, write with the candor of a man who is completely confident of his thesis.