Come Rain Or Shine
This idiom is used when people are very determined to do something and nothing can stop them.
Calm Before The Storm
The silent time before the start of any violent argument or activity is called calm before the storm.
Chase Rainbows
When someone chases rainbows, they try to do things which are impossible.
Caught With Your Hand In The Cookie Jar
When someone is caught red handed i.e. caught while doing something wrong we say he is caught with his or her hand in the cookie jar.
Call On The Carpet
When you are called by seniors or other powerful people for a reprimand we use this idiom.
Clean Sheet
A person with no criminal record or bad reputation is said to be the one with a clean sheet.
Crossing The Rubicon
When we have no returning back, i.e. only one option is left with us we use this idiom.