knight in shining armor

A selfless, chivalrous man who helps a woman in distress. When the police officer pulled over to help the old woman change her flat tire, she hugged him and said he was her knight in shining armor.

A rescuer or defender, as in What this political party needs is a knight in shining armor to change its tarnished image . This metaphoric expression alludes to a medieval knight. [Mid-1900s]

A wonderful guy. Fairy tales chronicled fair maidens in distress who were rescued at the last minute from dragons and ogres by a gallant knight in gleaming armor, where-upon they all lived happily ever after. Even if a young woman didn't view herself as a princess or consider herself in desperate straits, she still imagined herself being carried off by the man of her dreams, Prince Charming, a knight in shining armor.