put on weight
gain weight

You'll be putting on weight at the rate of about 1 pound per week now.

I hear he's put on weight since we last saw him.

It's made her look much better, she's put on weight, and stopped smoking.

I have also put on weight because exercising is difficult.

You put on weight more easily and it goes to different places.

I suppose that's why men in the past often put on weight after they'd gotten married.

A friend has described it as worth putting on weight for.

She looked great, because a program figure didn't put on weight the way a living one did.

Guess you've put on weight since I was out here last.

He had put on weight and looked a different person.