People who are downtrodden are treated very badly by people with power, and do not have the ability or the energy to do anything about it.
例句
The owner is making huge profits at the expense of downtrodden peasants...物主靠压榨农民而赢得暴利。His mother was old, badly dressed and obviously downtrodden.他母亲老了，衣着破旧，显然尝尽了苦难。