The idiom "unring the bell" means to undo or reverse a situation that has already happened, especially something that cannot be reversed. It suggests that once a certain action has been taken, it is difficult or impossible to go back and change it.

The idiom "sleep tight" is used to wish someone a good night's sleep. It implies that the person will have a restful and peaceful night, without any disturbances or worries. The phrase can also be used to express confidence in someone's ability to stay safe during the night.

The idiom "straighten up and fly right" means to correct one's behavior or actions, especially by following the rules or doing what is expected. It can also mean to behave correctly or to be upright in one's behavior.

The idiom "a shot in the dark" means taking a risk or making an attempt without any certainty of success, especially when there are no other viable options available.

The idiom "count on" means to depend or rely on something, especially someone, for a particular outcome or result. It can also mean to have confidence in the truth or accuracy of information.