The idiom "slow day" refers to a quiet or peaceful time, often when nothing much is happening or people are relaxing. It can also refer to a period of low activity or productivity in business or work-related contexts.

The idiom "time will tell" is used to indicate that it is difficult to predict the outcome of a situation at the present moment, but that further developments or events in the future will reveal more information.

The idiom "bird of passage" refers to someone who is temporarily passing through an area or situation, but does not have any permanent ties or connections to it.

The idiom "bundle of nerves" is used to describe someone who is very tense, anxious or nervous. It's a figurative expression that compares a person's emotional state to a bundle of twigs that are tightly tied together and are easily agitated or upset.

The "rule of thumb" is an idiomatic expression that refers to a general guideline or principle that provides practical advice or suggests a course of action. It is commonly used to describe a rule of practice rather than a specific law or regulation.