The crossword solution for the term 'GROW IN BULK' is 'SWELL'. This term is used to describe an increase in size or number, often in a short period of time. It can be used to refer to physical objects, such as a swelling in the body, or to abstract concepts, such as a SWELL in popularity. In this case, it is likely referring to a large increase in the amount of something, such as a crop or population.