The term 'FILLS TO THE GILLS' can be summarized by two crossword solutions, 'GLUTS' and 'SATES'. 'GLUTS' is a verb meaning to fill to excess or to overfill, while 'SATES' is a verb meaning to satisfy fully or to gratify. Both words imply that something is filled to the point of being completely satisfied or fulfilled. This phrase is often used to describe a situation in which someone has been given more than enough of something, such as food or drink.