1
general::
Be uninhibited about doing or saying something. For example, Feel free to borrow the car whenever you need it, or You want to state the case? Feel free. For a synonym, see BE MY GUEST.
American Heritage Idioms
2
general::
Phrase(s): feel free (to do something)
to feel like one is permitted to do something or take something. • Please feel free to stay for dinner. • If you see something you want in the refrigerator, please feel free.
McGrawhill's American Idioms And Phrasal Verbs