What idioms are Besides words and some grammar, language learners also learn many idioms. Especially English learners need to know many of them, because English is an idiomatic language. Many beginners feel terrified when they hear the word idiom for the first time. But there is nothing frightening about it. If I wanted to explain a beginner what the idiom is, I would simply say, that it is the type of phrase, that is a group of words, which has another meaning than its literal meaning.