The idiom "at sea" refers to a state of confusion, turmoil, or disorientation. It suggests a lack of direction, purpose, or stability in one's life or situation. The figurative meaning is often used metaphorically to describe someone who is lost or struggling to find their way in life.

The idiom "in cold blood" means to commit a crime or act of violence without any hesitation, intention, or remorse. It suggests that the person is calm and emotionless when carrying out such an action.

• He was in cold blood when he shot his wife.

The idiom "every picture tells a story" refers to the idea that each image or photograph contains hidden messages or meaning beyond its surface level.

The idiom "if it ain't broke, don't fix it" is a proverb that means not to make changes or improvements to something that is already working well or functioning properly.

The idiom "sell someone out" means to betray or inform against a person or group of people, often in exchange for money or other rewards. It can also mean to reveal confidential or sensitive information that could harm someone.