Idiom in English vocabulary

English and American linguists often use the term idiom.Seidl J.,McMordie W. English Idioms.Idiomatic english language.English is the main language of popular music, advertising, home computers and video games.Most of the scientific, technological and academic information in the world is expressed in English.In this case the English language comes to be one but very serious problem.Thats why, being a foreigner, one should avoid using idioms without knowing its meaning properly.Idiom is the most common term among the terminology used.There are also numerous idioms drawn from sports, arts, etc.The meaning of such expressions as distinguished from the meaning of free combinations is idiomatic.