# fatten up

> English word · Verb

## Definitions
1. To cause to gain weight by means of feeding.
2. To become fat or fatter by gaining weight.
3. To make bigger; to expand.

## Source
Compiled from Wiktionary via kaikki.org (CC BY-SA). Data vintage: 2026-05-06.
Canonical page: https://plainspell.com/en/word/fatten-up