The term 'reduce in size' can be solved by two crossword solutions: 'SHRINK' (6 letters) and 'DIMINISH' (8 letters). Both words refer to the process of making something smaller in size or amount. SHRINK is a more informal term, while DIMINISH is more formal. Both terms are commonly used in everyday language, and are often used in reference to physical objects, but can also be used to describe abstract concepts such as emotions or ideas.