Once in a (red/ blue/ yellow/ purple) moon
Once in a blue moon: very rarely, occasionally
(red/ green/ blue/ purple) with envy
Green with envy: jealous
A: "Sometimes, I think that I'll be happier teaching in Spain." B: "Well, (the grass is always always greener on the other side). You have already changed your career four times."
other people's lives or situations always seem better than your own
Feeling (red/ purple/ green/ blue)
Feeling blue: feeling sad
Pot calling the kettle (silver/ grey/ black/ brown)
Pot calling the kettle black: criticize someone while having that same fault yourself
"Hurry and (spill the beans) about Ben! I have been waiting all weekend," Lisa urged while hooking her arm to mine.
reveal a secret
"This is (a piece of cake)!" Billy exclaimed.
a very easy task/ something easily achieved
She was (in a pickle) because she forgot her keys and could not get into her house.
in a difficult situation
Smell a (cat/ pig/ rat/ elephant)
Smell a rat: to suspect that something wrong or dishonest is happening
Turn over a new (page/ leaf/ chapter/ soil)
Turn over a new leaf: start to act or behave in a better or more responsible way
"Don't (butter up) to me. I am not going to agree to your insane idea!" My best friend exclaimed while retreating from me.
flatter or praise someone as a means of gaining their help or support
Don't let the (rabbit/ dog/ crab/ cat) out of the bag.
Let the cat out of the bag: reveal a secret
