Some Useful Idioms with their meanings.
Caught between two stools
When someone finds it difficult to choose between two alternatives.
Costs an arm and a leg
This idiom is used when something is very expensive.
Cry over spilt milk
When you complain about a loss from the past.
Curiosity killed the cat
Being Inquisitive can lead you into an unpleasant situation.
Cut corners
When something is done badly to save money.
Cut the mustard
To succeed; to come up to expectations; adequate enough to compete or participate
Devil's Advocate
To present a counter argument. A person who expresses a contentious opinion in order to provoke debate or test the strength of the opposing arguments.
Don't give up the day job
You are not very good at something. You could definitely not do it professionally.
Don't put all your eggs in one basket
Do not put all your resources in one possibility.
Every cloud has a silver lining
Be optimistic, even difficult times will lead to better days.