Idioms and idiomatic expressions in English An idiom is a group of words in current usage having a meaning that is not deducible from those of the individual words. For example, "to rain cats and dogs" - which means "to rain very heavily" - is an idiom; and "over the moon" - which means "extremely happy" - is another idiom. In both cases, you would have a hard time understanding the real meaning if you did not already know these idioms! Idioms Quizzes: Have fun and test your knowledge of English Idioms by doing some of our 480 English Idioms Quiz Questions Idioms Forum: Ask questions about and discuss English idioms and sayings There are two features that identify an idiom: firstly, we cannot deduce the meaning of the idiom from the individual words; and secondly, both the grammar and the vocabulary of the idiom are fixed, and if we change them we lose the meaning of the idiom. How should one index an idioms reference? Find more English Idioms and Idiom Quizzes.
Related: Idioms, quotes, expressions/phrases & sayings
• Words, vocabulary and spelling