Idioms and expressions are important parts of any literary or dialectic culture. For anyone who is wondering what are idioms, they are groups of words that present information in a figurative or proverbial manner. Today, there are modern acronyms like BFF and pseudo-words like “frenemies.” There are many other idioms and expressions about friendship and relationships that are centuries old and still have an important place in modern culture. Here are a few examples of idioms about relationships that are used every day.