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to fatten up

to fatten up

10 2.3
To give extra food so a person or animal gains weight
  • phrasal verb
  • /ˈfætən ʌp/
translation icon : engordar
  • The vet suggested we fatten up the puppy by feeding it twice a day.
  • fatten up animals
  • food to fatten up
  • fatten up for slaughter

So that's a male castrated chicken that has been fattened up for sacrifice.

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Examples

Synonyms

to put on
vsto fatten up
58 2.2

To gain weight and become heavier

implies actively feeding someone to make them noticeably plumper
to fatten
vsto fatten up
45 2.2

To make an animal gain weight and a sauce taste richer by giving more or richer food

is the common phrasal way to make someone plumper by feeding more
to fill out
vsto fatten up
14 2.8

To become or make something fuller by adding more

specifically means increasing body fat and fullness by feeding more
to fat
vsto fatten up
8 7.7

To make someone gain body weight

focuses on making someone fatter specifically by giving more food
to plump
vsto fatten up
5 3.8

To make someone or something fuller and rounder

is focused more narrowly on gaining weight through feeding
to chub
vsto fatten up
  • Informal
1 9.1

To become slightly fatter by gaining weight

is the general act of increasing fatness usually through extra feeding
to flesh out
vsto fatten up
1 6.2

To become rounder and fuller, usually by gaining weight

focuses on feeding to increase fat rather than natural maturation changes
to fatten out
vsto fatten up
4.9

To make an animal or person gain weight

uses a similar process but in a casual phrasal form about feeding
to plump out
vsto fatten up
  • UK
6.1

To make someone or something rounder and fuller

emphasizes increasing size by feeding rather than only filling shape
to enflesh
vsto fatten up
9.9

To make an animal or person fatter

describes increasing fatness by feeding in everyday contexts rather than formal terms
to put some meat on someone's bones
vsto fatten up
  • Informal
9.1

To gain weight and become healthier after being thin or sick

is more about making someone fatter by feeding regardless of prior illness

Antonyms

328 1.7

To be very hungry and possibly die from no food

How Fat

to fatten up
10 2.3
to overfeed
1 3.5
to put on
58 2.2
to plump up
1 4.5
to lose fat
4 3.0

Surface Forms

fatten up infinitive
fattened up past participle
fattening up present participle
fattens up third person singular

Morphology

fatten + up

The meaning 'to make someone or something fatter' is directly derivable from combining 'fatten' (to cause to gain weight) with the particle 'up' (to increase or intensify). The particle only strengthens/completes the action rather than introducing an idiomatic shift, and this verb+up pattern is common, so a B1 learner who knows the parts will understand the MWE.

Etymology

The phrasal verb fatten up comes from farming life. On farms people gave animals extra food so they would fatten up before they sold them, creating a clear image of getting plump. That's why today fatten up means 'to make a person or animal gain weight'.