armor

a chink in someone's armour (British & Australian, American & Australian)

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.

See also: armour

a knight in shining armour (British & Australian, American & Australian)

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.

See also: armour, knight, shine

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a knight in shining armor

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.

Usage notes: usually said by a woman about a man

Etymology: in medieval times (= 500 to 1500 C.E.), knights were soldiers on horses who were also supposed to help and protect women

See also: knight, shine