fatten out fatten • fatten up · · · Info · Definitions · Synonyms · Characters · · fatten out · · Text Common · · Latin · · Scripts 10 · · Length 3 · · Syllables Definitions · · · (verb) make fat or plump. Synonyms: fatten, fat, flesh out, fill out, plump, plump out, fatten out, fatten up. Example: "We will plump out that poor starving child." · · Verb Definition 1 Synonyms · · · fatten · · Synonym 1 fat · · Synonym 2 flesh out · · Synonym 3 fill out · · Synonym 4 plump · · Synonym 5 plump out · · Synonym 6 fatten up · · Synonym 7 Characters · · space U+0020 a latin small letter a U+0061 e latin small letter e U+0065 f latin small letter f U+0066 n latin small letter n U+006E o latin small letter o U+006F t latin small letter t U+0074 u latin small letter u U+0075