The term 'LET's Fall' can be broken down into two crossword solutions: DROPS (5 letters) and VAILS (5 letters). DROPS is a noun that refers to the liquid form of precipitation, such as rain or snow. VAILS is a verb meaning to lower or reduce in intensity or strength. Together, these two words suggest that something is gradually decreasing in power or strength, such as the leaves falling from a tree in autumn.