The idiom "dos and don'ts" is a set of rules or guidelines for what is acceptable and not acceptable behavior in a particular situation or context. It can also refer to a list of instructions or tips for how to do something correctly.

The idiom "easy come, easy go" means that something gained easily can also be lost easily, or that good fortune tends to come and go without warning. It suggests a lack of stability in a situation.

"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 "so and so" is used to refer to a person or thing without using their name directly. It is typically used as a placeholder until the specific name is known or in cases where it is deemed inappropriate or disrespectful to use their name.

The idiom "double whammy" means receiving two negative things or situations one after another. It can also refer to a situation where the outcome is even worse than expected, causing a sense of shock or disappointment.