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fatten up

B1 informal separable both
In simple words

To make someone or an animal fatter by giving them lots of food.

Literal meaning: To make fat in a completed, thorough sense — 'up' implies completion.

Meanings

1 B1 neutral

To give an animal more food so that it gains weight, especially before slaughter.

"The farmer spent the autumn fattening up the pigs before the winter market."

Grammar: separable
2 B1 informal

To feed a thin person more in order to help them gain weight.

"Her grandmother immediately set about fattening her up with stews and fresh bread."

Grammar: separable
3 B2 idiomatic informal

(Figurative) To increase the size, value, or attractiveness of something.

"They fattened up the offer with a signing bonus to attract better candidates."

Grammar: separable
Usage notes

Commonly used for livestock being prepared for slaughter, or humorously about people. Can sound negative when used about people. Often used in the pattern 'fatten up for...'

Commonly used with

cattle pigs children Christmas slaughter season

Forms

Base
fatten up
I/you/we/they
3rd person
fattens up
he/she/it
Past simple
fattened up
yesterday
Past participle
fattened up
have + pp
-ing form
fattening up
continuous

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Synonyms

feed up bulk up plump up put weight on overfeed

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