separating unities from fusions is vague and even subjective. One and the same phraseological unit may appear motivated to one person (and therefore be labelled as a unity) and demotivated to another (and be regarded as a fusion). The more profound one's command of the language and one's knowledge of its history, the fewer fusions one is likely to discover in it.
The structural principle of classifying phraseological units is based on their ability to perform the same syntactical functions as words. In the traditional structural approach, the following principal groups of phraseological units are distinguishable.
A.Verbal. E. g. to run for one's (dear) life, to get (win) the upper hand, to talk through one's hat, to make a song and dance about something, to sit pretty (Amer. sl.).
B.Substantive. E. g. dog's life, cat-and-dog life, calf love, white lie, tall order, birds of a feather, birds of passage, red tape, brown study.
C.Adjectival. E. g. high and mighty, spick and span, brand new, safe and sound. In this group the so-called comparative word-groups are particularly expressive and sometimes amusing in their unanticipated and capricious associations: (as) cool as a cucumber, (as) nervous as a cat, (as) weak as a kitten, (as) good as gold (usu. spoken about children), (as) pretty as a picture, as large as life, (as) slippery as an eel, (as) thick as thieves, (as) drunk as an owl (sl.), (as) mad as a hatter/a hare in March.
D.Adverbial. E. g. high and low (as in They searched for him high and low), by hook or by crook (as in She decided that, by hook or by crook, she must marry him), for love or money (as in He came to the conclusion that a really good job couldn't be found for love or money), in cold blood (as in The crime was said to have been committed in cold blood), in the dead of night, between the devil and the deep sea (in a situation in which danger threatens whatever course of action