All languages have phrases or sentences that cannot be understood literally. Even if you know the meaning of all the words in a phrase and understand all the grammar of the phrase completely, the meaning of the phrase may still be confusing. Many proverbs, informal phrases, and common sayings offer this kind of problem. A phrase or sentence of this type is said to be idiomatic. This dictionary is a collection of the idiomatic phrases and sentences that occur frequently in American English.