Meanings (ES + gloss)
cebar • mejorar
To become better; to improve in condition; especially of animals, by feeding; to fatten up.
No, let him batten; when his tongue / Once goes, a cat is not worse strung.
Our vvomen batten vvell on their good-nature; / All they can rap and rend for the dear creature.
aprovecharse • medrar
Followed by on: to prosper or thrive, especially at the expense of others.
Robber barons who battened on the poor
There, in these Dens of Satan, […] do Sieur Motier's mouchards consort and colleague; battening vampyre-like on a People next-door to starvation.