Simple idioms to make your essay more better.
1. A red-letter day
an important day
2. A white elephant
no function
3. At a snails pace
slow
4. At the eleventh hour
last minute
5. Behind one's back
hiding
6. blood is thicker than water
inseparable
7. in black and white
on paper
8. in the timelight
the centre of attention
9. in the same boat
in the same situation
10. Kill two birds with one stone
achieving two things in one time
11. Rome was not build in one day
((accidentally i forget to write the meaning of what my teachers said))
12. Once in a blue moon
once in a while
13. Save it for a rainy day
save it for emergency
14. Start from sketch
start from nothing
15. Strike while the iron is hot
grab it when there is a opportunity
16. to break the ice
to know somebody
17. To build the castles in the thin air
impossible / dreaming
18. to clear the air
to talk things out
19. to have cold feet
nervous
20. to let the cat out of the bag
to tell the the secret
21. to make ends meet
to survive
22. to rain cat and dogs
raining heavily
23. turn over a new leaf
move on