R. S. Ginzburg, S. S. Khidekel, G. Y. Knyazeva, A. A. Sankin a course in modern english

can be easily found as a part of the quotation from Shakespeare “It is the green-eyed monster which doth mock the meat it feeds on” (Othello, II, i. 165). In Modern English, however, it functions as a non-motivated self-contained phraseological unit and is also used to denote the T.V. set. Achilles heel — ‘the weak spot in a man’s circumstances or character’ can be traced back to mythology, but it seems that in Modern English this word-group functions as a phraseological unit largely because most English speakers do not connect it with the myth from which it was extracted.

§ 22. Summary and Conclusions

1. The final criterion in the semantic approach is idiomaticity whereas in the functional approach syntactic inseparability is viewed as the final test, and in the contextual approach it is stability of context combined with idiomaticity of word-groups.
2.. The concept of idiomaticity is not strictly defined. The judgement as to idiomaticity is passed sometimes within the framework of the English language and sometimes from the outside — from the point of view of the mother tongue of the investigator.
It is suggested here that the term idiomaticity should be interpreted as an intralingual notion and also that the degree of idiomaticity should be taken into consideration since between the extreme of complete motivation and lack of motivation there are numerous intermediate groups.

3. 
   Each of the three approaches has its merits and demerits. The traditional semantic approach points out the essential features of all kinds of idiomatic phrases as opposed to completely motivated free word- groups. The functional approach puts forward an objective criterion for singling out a small group of word-equivalents possessing all the basic features of words as lexical items. The contextual approach makes the criterion of stability more exact.
   
4. 
   All the three approaches are sufficient to single out the extreme cases: highly idiomatic phraseological units and free word-groups. The status of the bulk of word-groups possessing different degrees of idiomaticity cannot be decided with certainty by applying the criteria available in linguistic science.
   
5. 
   The distinguishing feature of the new approach is that phraseology is regarded as a self-contained branch of linguistics and not as a part of lexicology. According to this approach phraseology deals with all types of set expressions which are divided into three classes: phraseological units, phraseomatic units and border-line cases.
   

IV. Word-Structure