Idioms have a non literal or idiomatic meaning, they take on a figurative meaning when certain words are combined.

Common Idioms

to refer to a person who is in unfamiliar, and often uncomfortable, surroundings.

to do or say something that makes people who do not know each other feel more
comfortable.

To do something or anger someone to where you cannot go back to how things were and cannot expect help in the future.

Bad treatment deservedly received for treating other people badly.

to say what you’ve wanted to say for a long time, resulting in a feeling of relief