Her political activism throws the apathy of others into sharp 'relief'. [=makes the apathy of others very noticeable]
His character provides a little 'comic relief' in what is otherwise a very serious and dramatic movie.
Just one day of sunshine would be a welcome 'relief' from the rainy weather we've been having lately.
(..) May I have a moment? You look lovely, Elizabeth. I apologize if I seem forward, but I must speak my mind. This promotion throws into sharp relief that which I have not yet achieved. A marriage to a fine woman. You have become a fine woman, Elizabeth. (..)2003 Pirates of the Caribbean: The Curse of the Black Pearl