Many often used phraseological units appeared many centuries ago. Very often expressions are applied by the modern person even when it is not absolutely appropriate. For example, what means and in what cases the expression "a stake on the mother-in-law head" is used?
Value
Once very long time ago, in age-old times, people made to themselves effective arms against opponents of a tree. They put long I will get sick on the next stub and just processed it the axe up to full sharpening.
It is clear, that the tree during such sharpening became sharper and terrible, but also quite often got to "support". But pleases in this situation one – the stub will feel nothing, to it all the same with what force and how many times on it the person got during sharpening of the weapon.
And here in this moment the communication of sharpening with a phraseological unit also appears. When people use a phrase "so pig-headed", they say that to the person frankly all the same that occurs or will occur in this situation. To the person so all the same in this situation as far as was all the same to a stub on which got the axe during sharpening of weapon.
Important point: some people today, using this phraseological unit, instead of the word "mothers-in-law" use another, but in consonance – "scratch". Actually such replacement of a word, let we understand point of expression even so, is quite misleading. The thing is that in a phraseological unit the word "mothers-in-law" is one of forms of the verb "tesat" or "stesyvat". The word means "to remove layer by layer from any surfaces.
Examples of use of a phraseological unit
The phraseological unit "so pig-headed" speaks not just about feelings, and about the most real position of the person in relation to the world around. This phraseological unit keeps within one capacious word - "indifference". For example, to the school student all the same that because of hooliganism at school it can not be taken in HIGHER EDUCATION INSTITUTION.
Some of the best-known indifferent people in the history can consider Merso (the fictional character". Merso is one of the main heroes of the novel "Stranger". This person is interested in no love relationship, he does not grieve for the death of the mother when he says goodbye to it. The only thing for what the hero regrets during the funeral in this novel, so it for lack of cigarettes and coffee.
Examples when concerning the person it is possible to use such phrase, much, and expression is applied both to fictional, and to real characters.
Conclusion
"So pig-headed" the modern person uses a phraseological unit very often and on business, from the moment of emergence of a phrase and up to now its sense did not undergo any serious changes.
The phrase is used concerning that person who very clearly shows indifference in this situation or in relation to other person.