"machacarse" in English

Aquellos jóvenes que entonces se manifestaron de forma totalmente pacífica ahora han envejecido antes de timpo, machacados a raíz de las terribles condiciones que imperan en las cárceles chinas.
Those young people who demonstrated entirely peacefully at the time are now prematurely aged, ground down as a result of the terrible conditions prevailing in Chinese prisons.
to swot up on {vb} [Brit.] [coll.]