Casual labor,

Definition of Casual labor:

1. Employment involving the performance of a variety of services usually on a temporary or part-time basis.

How to use Casual labor in a sentence?

1. Due to the addition of more automation equipment we have noticed that we can reduce our casual labor force by 50%.
2. Importing undeclared aliens from Mexico for casual labor has massively improved our profit margins, while keeping our taxes more manageable.
3. We decided to hire casual labor because the job was a one off and we did not want any more full time employees.