我没有要她吃苦头的意思。

It was not my intention that she should suffer.

他当初草率决定，现在吃苦头了。

He made a rash decision and now he is suffering for it.

你现在不下功夫，日后会吃苦头的。

If you don't work hard now, you'll suffer for it later.

万一你不听话，吃苦头的将是你，而不是别人。

In case you do disobey, you will be the one to suffer, not anyone else.