The phrase "heavy labour" is correct and can be used in written English.
You can use it to describe a job that requires a lot of physical work, such as manual labor. For example, "The construction project requires a lot of heavy labour."
Craft workers and operators and unskilled labourers were grouped together as heavy labour.
The weak were spared heavy labour but got a smaller ration of corn soup.
If tea-picking seems like heavy labour, there are more relaxing ways to enjoy Kericho.
For her, prostitution is a step up, providing flexible working hours, no heavy labour and a bigger income, she says.
Decades of use in the clothing industry, especially in the manufacture of overalls and trousers worn for heavy labour, have demonstrated denim's durability.
In the human body the large bulging muscles of an individual engaged in heavy labour are a good example of cellular adaptation.
They are particularly high in countries with heavy labour-market restrictions.
Many original members, with weak growth rates, heavy labour-market regulation and expensive welfare states, have been looking for ways to mitigate competition from central Europe.
A possible explanation for this discrepancy may lie in the fact that men previously performed heavier labour than women.
If occupation is corrected for total duration of work, it is clear that jobs requiring heavier labour (higher score on the classification of work (Table 1) are associated with a greater risk of developing ulnar nerve compression at the elbow.
In addition, questions were asked on ability to work and type of employment; classified as either heavy physical labour or light physical labour.
