The idiom "never in wildest dreams" means that something is extremely unlikely to happen or occur. It is a figurative expression used to convey the speaker's disbelief or skepticism towards a particular situation.

The idiom "call it a day" is commonly used to indicate that something has reached its end or completion. It can also be used to signify the end of a meeting, task, project, or activity.

The idiom "at sea" refers to a state of confusion, turmoil, or disorientation. It suggests a lack of direction, purpose, or stability in one's life or situation. The figurative meaning is often used metaphorically to describe someone who is lost or struggling to find their way in life.

The idiom "there's no such thing as a free lunch" means that nothing is truly free or without cost, and that there is always some form of compensation or benefit expected in return for something.

The idiom "prevention is better than cure" means that it's better to take steps to prevent something from happening rather than waiting for a problem to arise and then trying to fix it after the fact.