If children grow out of clothes, they become too big to fit into them.

If you grow out of an interest or way of behaving, you stop having or doing it as you become older.

Lucas says he wants to join the army when he turns 18, but I hope he'll grow out of the idea. 卢卡斯说他到18岁的时候要去参军，但我希望他随着年龄的增长会改变这种想法。

If an idea grows out of another one, it develops from it.

The idea for the story grew out of a strange experience I had last year. 这部短篇小说的构思源自我去年的一次奇特经历。