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.

Fig. a special weakness that provides a means for attacking or impressing someone otherwise invulnerable. (Alludes to an opening in a suit of armor that allows a weapon to penetrate.) Jane's insecurity is the chink in her armor. The boss seems mean, but the chink in his armor is that he is easily flattered.

someone who helps you when you are in a difficult situation She was looking for a knight in shining armor who might save her from her boring life.

if someone or something which seems to be strong has a chink in their armour, they have a small fault which may cause them problems She's a brilliant businesswoman, but her lack of political awareness may be the chink in her armour.

someone who helps you when you are in a difficult situation She looked around the bar to see if there was a knight in shining armour who might come and save her from this awful man.

A vulnerable area, as in Putting things off to the last minute is the chink in Pat's armor and is bound to get her in trouble one day . This term relies on chink in the sense of "a crack or gap," a meaning dating from about 1400 and used figuratively since the mid-1600s.

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.