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general::
Phrase(s): Don’t worry your (pretty little) head about it.
Rur. Do not worry about it. (Said condescendingly, and can cause offense.) • Mary: How are you going to get another job if you don’t start looking for one? Tom: Now don’t worry your pretty little head about it. Just leave it to me. • Tom: What are we going to do if we can’t find an apartment? Sally: Don’t worry your head about it. We’ll find one, one way or another.
McGrawhill's American Idioms And Phrasal Verbs