Fatten up

My cat looks underweight, so I'll fatten him up with higher-calorie cat food.

I visited my mother for a month, and she managed to fatten me up 20 pounds.

‘And isn’t Declan looking very thin?’ Madge said. ‘He’ll never get a wife if he doesn’t fatten up a bit.’

We must not fatten up our payroll with people performing nonessential activities.