fatten

/ˈfætən/
verb
  1. To make a person or animal fatter, usually by feeding them more.
    • She tried to fatten her skinny cat with extra meals.
    • The farmer fattens the pigs before the winter market.
    • Some people fatten geese to produce foie gras.
  2. To become fatter or heavier.
    • The bear fattens in autumn to prepare for hibernation.
    • If you eat too much dessert, you will fatten quickly.
    • He started to fatten after months of eating rich food.
  3. To increase the amount or size of something, especially money or profits.
    • He took on extra work to fatten his savings account.
    • The company hopes to fatten its profits with the new product line.
    • Investors fatten their portfolios by buying low and selling high.