The idiom "out of mind" refers to something that is no longer being thought about or considered, often because it is irrelevant or not important. It can also indicate that someone has forgotten something, either intentionally or unintentionally.

The idiom "look before you leap" is a piece of advice that means one should carefully consider the potential consequences or risks of an action before deciding to take it. It encourages caution and delay, rather than rushing into something without fully understanding the implications.

The idiom "ducks and drakes" refers to a set of objects or situations that are mutually exclusive or have opposite characteristics. It is often used to describe two things that are opposite in some way, such as happy and sad or hot and cold.

The idiom "turn a blind eye" means to pretend not to notice or care about something, especially something that is wrong or unpleasant. It is often used when someone is intentionally avoiding or ignoring a problem.

The X Factor is an idiomatic expression used to describe something or someone that has a unique, special, or mysterious quality that makes it stand out from others.