Peculiar to a language can be described as an IDIOM (5 letters) or idiomatically (9 letters). An IDIOM is a phrase or expression that has a figurative meaning which is different from its literal meaning. Idioms are used in everyday language and are often specific to a certain culture or language. IDIOMATIC expressions are phrases or sayings that have a figurative meaning, but are not necessarily specific to a certain culture or language.