"Bat an eye" is an idiomatic expression used to convey surprise or shock, usually when someone does something unexpectedly or makes a revelation that catches people off guard. The phrase is often used as an exclamation of astonishment and can be used in both positive and negative contexts.

The idiom "boil the ocean" means to try to do something that is beyond one's capabilities or to take on more than one can handle. It often implies trying to do something quickly or efficiently, but ultimately failing.

The idiom "cold sweat" refers to a sudden feeling of fear, anxiety, or stress that causes one's skin to become clammy and cold with sweat, even though they are not physically exerting themselves. It can also refer to a situation or event that instills such feelings in a person.

The idiom "coin money" means to make a lot of money quickly or easily. It is often used to describe someone who is successful in their business or financial investments.

The idiom "good account of" means to have a detailed explanation or accurate information about something. It can also imply being able to provide an account or report about something, as well as having a thorough understanding of a topic.