fatten up

(redirected from fattened up)

fatten up

To cause to gain weight or become fatter by feeding. A noun or pronoun can be used between "fatten" and "up." A: "Wow, your mom made quite a feast!" B: "I know, she seems determined to fatten us up." We need to fatten up these scrawny little kittens.
See also: fatten, up

fatten (someone or an animal) up (with something)

to use something to make someone or an animal fat. We will fatten the calf up with corn. I don't know why they keep fattening up their children with so much food.
See also: fatten, up

fatten up

 (on something)
1. Lit. to get fat by eating something, The cattle fattened up on the succulent grass. The bears have to fatten up on food before they hibernate for the winter.
2. Fig. to become prosperous because of something. The corporations fattened up on easy profits and low taxes. The directors of the company fattened up even during the recession when the workers were laid off.
See also: fatten, up
References in periodicals archive ?
The Third Republic, starved out, fattened up Prussia.
The Columbia team found that the activity of macrophage-linked genes increased at a gradual pace initially, as an animal fattened up. The number of macrophages present in a plumping animal's adipose tissue also rose gradually.
To rule out the possibility that the carp fattened up simply because each individual had more food after the pike reduced their numbers, Bronmark and Miner conducted a second experiment in the laboratory.
Ordinarily, the intermountain lambs are fattened up to about 120 pounds and placed on the market in fall and winter.