The term 'fill up' can be interpreted in a variety of ways. The crossword solutions for this term include GAS (3 letters), BRIM (4 letters), RECRUIT (7 letters), OVERFLOW (8 letters), EAT (3 letters), CRAM (4 letters), LOAD (4 letters), SATE (4 letters), GORGE (5 letters), OCCUPY (6 letters), SATIATE (7 letters), and SATURATE (8 letters). GAS is often used to refer to the fuel used to power vehicles, while BRIM is the top edge of a container or cup. RECRUIT is a verb meaning to enlist someone into a service or organization, and OVERFLOW is when something is filled beyond capacity. EAT is a verb meaning to consume food, and CRAM is to fill something with an excessive amount of items. LOAD is to put a large amount of something into a container, and SATE is to satisfy someone's hunger or thirst. GORGE is to EAT a large amount of food, OCCUPY is to take up space or time, SATIATE is to satisfy someone's hunger or thirst, and SATURATE is to fill something completely.