The idiom "cloud nine" is used to describe someone who is extremely happy or ecstatic about something. It is a metaphorical expression that means the person feels like they are floating on a cloud nine, which is a legendary place in mythology where gods and goddesses lived.

The idiom "in the nick of time" is used to describe an action or event that occurs just before something else happens, often in a timely manner or at the last possible moment.

The idiom "pot calling the kettle black" is used to describe a situation where two people or things are being compared, but one of them is being criticized for something that the other person is also guilty of doing.

The idiom "treasure trove" is used to describe something valuable or worthwhile that has been discovered or found unexpectedly. It can also refer to a large quantity of something that is useful, interesting, or entertaining.

The "ugly duckling" is an idiom that refers to someone who appears to be unattractive or unpleasant, but turns out to be more attractive than expected. It is often used to describe a person's initial appearance or behavior.