The idiom "burn the candle at both ends" means to work very hard and not take any time off, or to exhaust oneself by working too much. It is a figurative expression that compares the act of working long hours to the literal act of burning a candle from both ends until it runs out of wax.

The idiom "as mad as a hatter" is used to describe someone who is extremely angry, furious, or insane. It means that the person has lost their mind and is behaving in an irrational way. The figurative meaning of the idiom is often used to exaggerate how angry or mad someone is.

The idiom "hit the nail on the head" means to make an accurate or precise statement, to describe something exactly as it is. It can also mean to solve a problem or perform a task very well.

"Under fire" is an idiomatic expression that means to be in a difficult or challenging situation, often involving criticism or opposition from others. The phrase can also refer to being under attack or facing adversity in general.

The idiom "drop dead" means to die immediately, suddenly, or unexpectedly. It's often used to express surprise or shock at someone's death, especially if it's sudden and unexpected.