Verb
(intransitive) To become more heavy or obese.
Synonyms: put on weight, (UK slang) put some timber on
Antonym: lose weight
(of an idea, view etc.) To be taken more seriously.
Source: en.wiktionary.orgMen are allowed to age. Men are allowed to gain weight. Men are allowed to be quirky looking. Janeane Garofalo
Running is what keeps my weight down. I have to stay active or I could easily gain weight. Camilla Luddington
It's normal to gain weight during pregnancy. It's something that has to happen to your body. Carnie Wilson
I eat cheese and salami and a lot of fried chicken. I eat a big bag of oatmeal-raisin cookies every night and I don't gain weight. I still look OK as long as I'm dressed. Ellen Barkin
A lot of people give actors credit when they gain weight for a role in a drama when they win an Oscar, but when you're doing a sitcom, people don't give you a lot of credit, because you've got to keep your weight on for five or six years if it's successful. Mike O'Malley
Well, obviously, as soon as I'd finished the script I read a lot of books on Winston Churchill, and started to gain weight and really prepare emotionally, mentally and physically for the role. Christian Slater