How to say in Czech: They don’t know what they mean by that.

English
don’t know what mean by that.
Czech
Oni nevědí, co tím chtějí říct.
What do you mean by that?
I don’t get what you mean.
How do you mean?
They don’t know what to do anymore.
They just don’t know what to say.
I didn’t mean to hurt you.
The end justifies the means.
He knows what they did last year.
He knows what they did yesterday.
I don’t know what it is.

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