The idiom "the last straw" refers to a situation or event that is the final thing that someone can tolerate or endure before they take action, such as quitting a job or leaving a relationship.

The idiom "down the drain" is used to describe something that has gone wrong or something that is lost forever. It can also be used to describe something that is no longer useful or valuable. The figurative meaning of the phrase is that it's gone for good, there's no coming back from it.

The idiom "in deep water" means to be in a difficult or dangerous situation that requires expertise or specialized knowledge to navigate effectively. It can also mean being overwhelmed or stuck in a problem that seems insurmountable.

The idiom "back to the wall" means that someone is facing a difficult or challenging situation where they feel helpless or trapped. They may feel like they have no other options or choices left, and their back is against the wall.

The idiom "as soon as" means that something will happen immediately or as soon as possible after a certain action, event, or condition is met. It is used to express the expectation that an action or situation will take place quickly or promptly.