The phrase "put on some weight" is correct and usable in written English.
You can use it when talking about gaining weight, for example: "I want to put on some weight, so I'm going to start eating more protein."
She seemed to be doing well, too — she had even put on some weight, he noticed.
Mr. Francis has put on some weight since then, and his knees aren't what they used to be.
But he got bigger and put on some weight, and mentally he's probably a lot sharper than he was".
Pandora, who has put on some weight herself, assumes the role of Edison's sponsor and sergeant, and together they embark on a liquid diet.
She'd put on some weight, and wasn't dressing in a very flattering way.
"I was starting to go through puberty and get some curves and put on some weight," she says.
"I am willing to wager that these will follow the classic pattern of putting on some weight with age, and of getting rediscovered by the revisionists in a few years," said Jeremy Seysses, whose family owns Domaine Dujac in Morey-St.-Denis.
After putting on some weight, when they feel a warm updraft of wind beneath their wings sometime around early April, it is time to continue moving north.
By not overdoing a southern accent while also reportedly voluntarily putting on some weight for the role, actor David Oyelowo shines in this film.
Since the incident, Barton has been forced to slow down and focus on her health, which has meant putting on some weight -- something she says hasn't gone unnoticed by critics.
If you want to increase your breast mass, then putting on some weight (and thereby gaining extra fat) may do the trick.
