put on weight
gain weight

Only a small number of people gain much more weight.

So why did I gain weight the last two days?

She couldn't have gained weight in the past few hours.

Others, like him, gain weight no matter what they do.

Find someone who has gained weight in the past three months.

I've seen kids gain weight from playing too many video games.

When they asked if he has gained weight, I've said yes.

But then I had some problems in life and started gaining weight.

No one could figure out why she was gaining weight.

He also told me not to gain weight and to watch out when I drove at night.