red
Caught red-handed
Caught in the act of doing something wrong.
Once in a blue moon
Very rarely.
Green with envy
Very jealous.
black sheep
The odd or disreputable member of a group
White lie
A small, harmless lie
In the red
Owing money, having financial problems.
Out of the blue
Unexpectedly.
Give the green light
Give permission.
In the black
Financially stable or profitable
Wave a white flag
Surrender or give up.
See red
Become very angry.
Feeling blue
Feeling sad.
Green thumb
A natural talent for gardening
Black and white
Clear and simple, without confusion.
As white as a ghost
Extremely pale.