Some English idioms

A Blessing In Disguise
Something good that isn't recognized at first
A Doubting Thomas:
A skeptic who needs physical or personal evidence in order to believe something.
A Drop in the Bucket:
A very small part of something big or whole.
A Penny Saved Is A Penny Earned:
By not spending money, you are saving money (little by little).
A Piece of Cake:
A task that can be accomplished very easily.
Add Fuel To The Fire:
Whenever something is done to make a bad situation even worse than it is.
At The Drop Of A Hat:
Willing to do something immediately.
All In The Same Boat:
When everyone is facing the same challenges.
Against The Clock:
Rushed and short on time.
A Taste Of Your Own Medicine:
When you are mistreated the same way you mistreat others.
Bring the curtain down
If you bring the curtain down on something, you bring it to an end.