This idiom means "sometimes, rarely".
once in a blue moon
Become very angry.
see red
This idiom means "to owe money".
in the red
This idiom means "to reveal your real character".
true colours
Be a good gardener.
have a green thumb
Very jealous.
green with envy
Catch sb with smth he/she has done.
catch sb red-handed
Someone of noble or aristocratic birth.
blue-blooded
Suddenly, unexpectedly.
out of the blue
Say untrue things because you don't want to hurt sb with the truth.
white lie
Be born into a rich family.
born with a silver spoon in one's mouth
Very different from others, of a bad quality; a person who doesn't fit.
black sheep
Hurt, beaten and injured.
black and blue
Not knowing anything.
in the dark
Incredible chance.
golden opprotunity
This idiom refers to excessive bureaucracy, official rules, or paperwork that causes unnecessary delays.
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