Animals
This means that people usually behave differently when others are no watching them.
when the cat's away, the mice will play
This means that something is very expensive.
to cost an arm and a leg
This means to get older.
over the hill
This expression means that someone is really happy or excited.
on cloud nine or in seventh heaven
This expression means it is raining very hard
It is raining cats and dogs
This means that people usually behave the way their friends do.
Birds of a feather flock together
This means that someone likes to eat a lot of candy and sweets.
to have a sweet tooth
This means to make a small problem into a big problem
to make a mountain out of a molehill
This means that something happens very rarely or sometimes.
once in a blue moon
This expression means that you are upset or embarrassed after saying something stupid
To put your foot in your mouth
One's words are stronger than one's actions.
Your bark is worse than your bite
This means to be very infatuated or in love with someone.
head over heels in love
This means that something is getting worse or declining.
going downhill
This means that something is the very best and there is nothing else like it.
Second to none
This expression means that you cannot have everything or two things at once
To have your cake and eat it too
Becoming more humble or more modest.
Get off your high horse
This means to hurry up and leave
shake a leg
This means that someone knows how to do something very well
second nature
This means that you finally realize something after observing something; it also means that you come to a conclusion
To put two and two together
This expression means that things happen by chance, or by odds.
The luck of the draw
This means don't do something after the problem has already happened; it is too late.
Don't lock the barn after the horse is stolen
This means to agree with someone or to share the same opinions and ideas.
to see eye to eye
This means that one problem is only one of many problems.
the tip of the iceberg
This means that you change your mind about something after thinking about it for a long time.
on second thought
This expression means that if you hang out with bad people, you will also suffer the consequences of their actions.
If you lay down with dogs, you will wake up with fleas