1. （用作儿语）成年人，大人
    A grown-up is an adult; used by or to children.

    e.g. Jan was almost a grown-up...
           简都快是个大人了。
    e.g. Tell children to tell a grown-up if they're being bullied.
           告诉孩子们，如果被人欺负就告诉大人。

2. 成熟的；成年的；长大的
    Someone who is grown-up is physically and mentally mature and no longer depends on their parents or another adult.

    e.g. I have grown-up children who're doing well.
           我的几个孩子已经长大成人并且事业有成。

3. 似成人的；成熟的
    If you say that someone is grown-up, you mean that they behave in an adult way, often when they are in fact still a child.

    e.g. She's very grown-up.
           她表现得很像个大人。

4. 适于成人的；成人的
    Grown-up things seem suitable for or typical of adults.

    e.g. Her songs tackle grown-up subjects...
           她的歌曲唱的都是成年人的事情。
    e.g. She talked in a grown-up manner.
           她说起话来像个大人。