1. 掩盖;隐藏
    If you conceal something, you cover it or hide it carefully.

    e.g. Frances decided to conceal the machine behind a hinged panel...
           弗朗西斯决定把机器藏在带铰链的嵌板的后面。
    e.g. Five people were arrested for carrying concealed weapons.
           5人因身上藏有武器被捕。

2. 隐瞒（信息);掩饰(感情)
    If you conceal a piece of information or a feeling, you do not let other people know about it.

    e.g. Robert could not conceal his relief...
           罗伯特无法掩饰自己如释重负的心情。
    e.g. She knew at once that he was concealing something from her.
           她马上知道了他有事瞒着她。

3. 掩盖;遮住
    If something conceals something else, it covers it and prevents it from being seen.

conceal的反义词

    e.g. ...a pair of carved Indian doors which conceal a built-in cupboard...
           嵌入式壁橱上的一对印度雕花门
    e.g. The hat concealed her hair.
           帽子遮住了她的头发。