Sit on the fence – not wanting to make a decision
Once in a blue moon – extremely rare
Cut corners – done badly to save money
Cry over spilt milk – upset over something in the past
Jump on the bandwagon – join a popular trend or activity
Keep something at bay – keep something away
Let sleeping dogs lie – do not disturb a situation
Make a long story short – go to the point
Let the cat out of the bag – tell a secret
See eye to eye – two or more people agree on something