The idiom "a wet blanket" refers to a person who is overly negative, critical or unenthusiastic about something. They are often the ones who bring down the mood of others by dampening their spirits with their dampened attitude and lack of enthusiasm.

The idiom "rough diamond" refers to a person who has good potential or qualities but needs work or refinement before they can be fully realized. It can also refer to a person who is rough around the edges, meaning they may have some flaws or shortcomings that need to be addressed.

The idiom "great minds think alike" refers to the idea that people who are highly intelligent or knowledgeable tend to have similar thoughts, ideas, or opinions.

"Spanner in the works" is an idiom that means a sudden and unexpected event or occurrence that disrupts or hinders a planned or ongoing activity. The figurative meaning of this idiom is that it can cause chaos, confusion, or frustration in the workplace or in personal relationships.

The idiom "pin money" means to earn a small amount of money that is just enough to cover one's basic needs or expenses. It is often used to describe a low-paying job or a situation where someone is struggling financially.