WWordGenerator.org GeneratorsWord ListsBlogAboutGenerate a word Home / F / fatten up fatten up verb 9 letters Scrabble 13 WWF 16 Definitions verb make fat or plump fatfattenfatten outfill outflesh outplumpplump out Look “fatten up” up elsewhere Wiktionary ↗ Merriam-Webster ↗ Etymonline ↗ Dictionary.com ↗ Want another word?Spin the dictionary for a fresh one. Generate a word →