This phrase consists of 2 words, shut and up. 'Shut' means to block an entrance, prevent access to, or close an entrance to keep out a being. 'Up', easily said, means a higher position, or towards a higher position (upwards).
However, when these two words come together, they create an informal, and rather harsh phrase meaning, "stop talking".
This phrase is probably a shortened version of, 'shut your mouth up'.
As crude as it sounds, the basic meaning is to block an entrance by going towards a higher position. In other words, to close the mouth by pushing the lower jaw to a higher position (which evidently closes the mouth).
Though complicatedly composed, this is the basic meaning of the phrase.
As mentioned above, 'shut up' was probably a shorter way of saying, 'shut your mouth'. I believe that the word 'jaw', was loosely replaced by the word 'mouth'.
(Who would go around saying 'shut your jaw up?!' I mean when you are informal, or angry, no need to be so exact!)
So this, is my understanding of what 'shut up' means.
Thank you.
However, when these two words come together, they create an informal, and rather harsh phrase meaning, "stop talking".
This phrase is probably a shortened version of, 'shut your mouth up'.
As crude as it sounds, the basic meaning is to block an entrance by going towards a higher position. In other words, to close the mouth by pushing the lower jaw to a higher position (which evidently closes the mouth).
Though complicatedly composed, this is the basic meaning of the phrase.
As mentioned above, 'shut up' was probably a shorter way of saying, 'shut your mouth'. I believe that the word 'jaw', was loosely replaced by the word 'mouth'.
(Who would go around saying 'shut your jaw up?!' I mean when you are informal, or angry, no need to be so exact!)
So this, is my understanding of what 'shut up' means.
Thank you.