Blue was used as protection against witches, who supposedly dislike the color.
Blue stands for love, which is why a bride carries or wears something blue on her wedding day.
“Feeling blue” is feeling sad. “Blue devils” are feelings of depression.
Something “out of the blue” is from an unknown source at an unexpected time.
The first prize gets a blue ribbon.
A blue blood is a person of noble descent. This is probably from the blue veins of
A “bluestocking” used to be a scholarly or highly knowledgeable woman.
The pharaohs of ancient Egypt wore blue for protection against evil.
“Blue laws” are used to enforce moral standards.