The idiom "icing on the cake" means something that is an added bonus or a pleasant surprise, often making the original situation even better. It can also mean a small amount of something that makes a significant difference, like adding sugar to a dish.

The idiom "out of hand" means that something is happening or being done without any control, direction, or supervision from someone in charge. It can also refer to a situation where there is no order, chaos, or disorder.

The idiom "done for" means that someone is completely finished or defeated. It can also mean that someone has been punished or reprimanded so severely that they are now out of business or out of the picture.

The idiom "chattering classes" refers to a group of people who like to talk or gossip about various topics, often in social settings.

The idiom "grit one’s teeth" means to face a difficult situation or person with determination and courage, despite feeling uncomfortable or angry.