This term is most frequently used in terms of salary; an employee can receive their salary grossed up, which means that they would receive the full salary promised to them, without deductions for tax.
Use gross up in a sentence
We suggested that he gross up the report to be more meaningful as we were at a critical stage in the project.
I didn't like that it would be a gross up, because then it would all have to be incurred by the receiver, which was me.
ABC Company offered to gross up John Smith's salary in order to retain him as a valued employee in their widget department.