With a heavy or abrupt drop:
To thrive is defined as to be successful in managing business or money.
Swell is defined as to grow larger beyond the normal size.
To block (a passage); plug:
To enrich is defined as to improve something or make something better.
To satisfy the hunger or desire of; feed or satiate
To feed a large amount of food to (an animal).
So as to be thin:
To constrict is to become narrower at one place, or to make something narrower or more restrictive.
To reduce is to make something smaller or to become or feel smaller, or forcing someone into a less desirable position.
To cause to suffer from a lack or need of something specified
To come to be by a gradual process or by degrees; become:
Find another word for fattens. In this page you can discover 15 synonyms, antonyms, idiomatic expressions, and related words for fattens, like: plumps, thrives, swells, stuffs, feeds, enriches, battens, fills, crams, expands and thins.