1. to make or become fat or fatter; to increase in weight or body mass
Usage: transitive or intransitive; commonly used in agriculture and animal husbandry
2. to make rich, prosperous, or abundant; to enrich
Usage: transitive; figurative use

Examples

• The farmer fattens cattle before selling them to market.
• A diet high in calories fattens most people quickly.
• The pig fattens on corn and grain throughout the summer.
• Success fattens the ego of some athletes.
• Regular investment fattens your savings account over time.
• She fattens her chickens with premium feed.
• The holiday season fattens wallets for many retailers.