English dictionary fatten up meaning and definition Definition and meaning of fatten up at MeaningMonkey.org. fatten up meaning and definition in the English Dictionary. FATTEN UP verbDefinition of fatten up (verb)make fat or plump"We will plump out that poor starving child"synonyms: fat, fatten, fatten out, fill out, flesh out, plump, plump out Source: Princeton University Wordnet
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