say untrue things because you don't want to hurt sb with the truth
a white lie
catch someone doing something wrong
catch someone red-handed
be born into a rich family
to be born with a silver spoon in your mouth
to remove unnecessary administration processes
to cut through red tape
suddenly, unexpectedly
out of the blue
waste your time without getting results
blue in the face
to not know anything about a certain situation
to be in the dark
to make someone feel very important (usually at an event)
to roll out the red carpet
feeling sad
feeling blue
to owe money
to be in the red
very rarely
once in a blue moon
very jealous
to be green with envy
to reveal your real character
to show your true colours
become very angry
to see red
be a good gardener
have a green thumb
an incredible chance
a golden opprotunity