Black and white
a situation, rule, or issue is clear, straightforward, and easily understood, leaving no room for nuance, ambiguity, or debate
be in the red
to be in debt
green with envy
extremely jealous
Out of the blue
completely unexpectedly
tickled pink
someone who is extremely pleased, delighted, or amused about something
black market
illegal trading of goods that are not allowed to be bought and sold
see red
to suddenly become very angry
give someone the green light
to give permission to start something
feel blue
to feel sad or depressed
paint the town red
to go out and enjoy yourself by drinking alcohol, dancing, laughing with friends
White lie
a minor, harmless untruth told to avoid hurting someone's feelings, to be polite, or to avoid trivial trouble
a red herring
something that distracts from the real issue
The grass is always greener on the other side
Thinking that other people’s situations or lifestyles are better than one’s own.
once in a blue moon
very rarely
grey matter
brain power
a white elephant
a possession that is useless or troublesome, especially one that is expensive to maintain or difficult to dispose of.
caught red-handed
caught while committing a crime or wrongdoing
Have green fingers
to be good at gardening and making plants grow well
blue-collar
relating to manual work or workers, particularly in industry.
grey area
a situation that is unclear or not clearly right or wrong
The pot calling the kettle black
When a person criticizes someone for a fault they also possess
red tape
excessive bureaucracy or official rules
a greenhorn
a person who is new to or inexperienced at a particular activity.
Blue blood
noble birth
silver-tongued
very persuasive