If you say, " I was only fooling" that means you are not serious. You are kidding.

如果你说，" I was only fooling" 。那就意味着你不是认真的，你只是在开玩笑。

For example, " The child said he was sick but he was only fooling. He was in perfect health."

比如说，" 那个孩子说他病了，其实他是刷花招。他身体好着呢。"

You know you're only fooling yourself, right?

你知道你只是自欺欺人 不是吗？

If you say, “I was only fooling” that means you are not serious.

如果你说，“我只是在开玩笑”，那意味着你不是认真的。

The moral of this idiom is: if you try to fool others, you are only fooling yourself.

这句成语的寓意是：如果你试图愚弄别人，你只是在愚弄自己。

So, if you say something to someone as a joke but they take you seriously, you can say to them, " I was only fooling."

所以，如果你对别人说了玩笑话，对方却当真了，你就可以对他们说" I was only fooling。"