An idiom is a special phrase or expression in the English language that doesn't really mean what the words say. For example, "break a leg" doesn't actually mean someone should break a leg, but is a way to wish someone good luck. Idioms can be confusing for non-native speakers because they don't always make logical sense. But, just like how we learn new rules for playing games or making crafts, we can learn and understand idioms with practice and patience!