The idiom "break new ground" means to do something innovative, pioneering, or experimental that has never been done before. It refers to taking a bold step or making a significant discovery that pushes the boundaries of what is considered normal or standard.

The idiom "cash in" means to make money or profit from something, often by taking advantage of a situation or opportunity. It can also refer to receiving payment or compensation for goods or services rendered.

The idiomatic expression "know which side one's bread is buttered" means to know which group or team an individual belongs to, what their allegiances are, or what their interests are.

The idiom "last long" means to endure or continue for a long time. It can also mean to last a longer period of time than expected or desired, often implying that the situation is not improving or worsening.

The idiom "walk on eggshells" means to be extremely careful not to do or say anything that could upset, offend or embarrass someone. It is often used when someone is sensitive about a particular topic or situation and cannot handle criticism or negative comments.