"Hard labour" refers to physical or manual work that is very demanding, exhausting, and requires a lot of effort and strength. It often involves intense physical activity and can be tough on the body. Full definition
They have been put in prison for 6 months with hard labour. (citifmonline.com)
Thus unto all of religious belief / the atheist be as the farmer whom having / cleared the land of weed stone through sweat as hard labour being now prepared in planting the seed. (religion.blogs.cnn.com)
North Korea's supreme court sentenced American student Otto Warmbier to 15 years of hard labour for crimes against the state, China's Xinhua news agency reported on Wednesday. (businessinsider.com)