The term 'fill out' can refer to a variety of activities, such as completing a FORM or document, adding more information to something, or making something larger. The crossword solutions for this term are SWELL (5 letters), EXTEND (6 letters), EXPAND (6 letters), GROW (4 letters), FORM (4 letters), and PAD (3 letters). Each of these words can be used to describe the action of filling out something, whether it is by increasing its size, adding more information, or forming it into a certain shape. Swelling, extending, expanding, growing, forming, and padding are all ways to fill out something, and each of these words can be used to describe the process.