Phrase guide

fatten up

verb · 4 senses · updated from the 2026-07-25 local source snapshot

Definitions and examples are grouped by meaning. Pronunciation, history, word forms, translations, descendants, synonyms, antonyms, derived terms, and related words appear whenever the source provides them.

Sound

Pronunciation

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No pronunciation record was provided for this word.

1

verb

Meaning 1

To cause to gain weight by means of feeding.

Definition source: English Wiktionary via Wiktextract

Usage: transitive

Examples

  • My cat looks underweight, so I'll fatten him up with higher-calorie cat food.
  • I visited my mother for a month, and she managed to fatten me up 20 pounds.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

2

verb

Meaning 2

To become fat or fatter by gaining weight.

Definition source: English Wiktionary via Wiktextract

Usage: intransitive

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

3

verb

Meaning 3

To make bigger; to expand.

Definition source: English Wiktionary via Wiktextract

Usage: figuratively, transitive

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

4

verb

Meaning 4

make fat or plump

Definition source: Princeton WordNet 3.0

Examples

  • We will plump out that poor starving child

Meaning relationships

Synonyms: fatten, fat, flesh out, fill out, plump, plump out, fatten out

Antonyms: none provided

Broader terms: change, alter, modify

History

Etymology

No etymology was provided for this word.