The idiom "eat humble pie" is used to describe a situation where someone has made a mistake or committed an error, and they are forced to admit their fault and apologize.

The idiom "make a virtue of necessity" means to turn a difficult or unpleasant situation into an advantage or positive outcome. It implies that the person is taking action in response to circumstances beyond their control and is finding a way to make the best of it.

The idiom "bee in bonnet" refers to someone who is overly agitated or upset about something, often to the point of obsession. This person may be fixated on a particular issue and unwilling to listen to other perspectives or reason with others.

The idiom "wrap one’s head around" means to understand, grasp or comprehend something completely. It can also imply the ability to think clearly, logically and make sense of something complex.

The idiom "red book" refers to a collection of information or data that is considered important or valuable. It can also refer to a list of rules, regulations, or guidelines that must be followed.