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.
See also: fatten, on, up
Farlex Dictionary of Idioms.
- fatten up
- fatten
- fatten (one) up with (something)
- go on a diet
- on a diet
- put (one) on a diet
- kitty
- fatten the kitty
- do to excess
- drank