It is known as the principle of asshu or assaku which means compression...
In judo such compression movements are considered 'hishigi', (hiji hishigi).
There is much debate about the legality of this hold and it is most often used to set up the straight arm lock.
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While the old form, jujutsu, was studied solely for fighting purposes, Kano's new system is found to promote the mental as well as the physical faculties.
T. Shidachi, 1892
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