Idioms

fatten up on (something)

fatten up on (something)

To gain weight or become fatter by eating something in particular. It seems like the dog is fattening up on that new food. My mom loves baking and will definitely try to fatten you up on sweets. Considering how the baby keeps losing weight while breastfeeding, I wonder if the doctor will want us to fatten her up with formula.
See also: fatten, on, up
Farlex Dictionary of Idioms. © 2024 Farlex, Inc, all rights reserved.
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