godan verb (-ru), intransitive verb
get fat; become chubby
Slang, often derogatory or self-deprecating. Derived from デブ (fat person).
See also: デブ
最近食べすぎてデブってきた。
I've been eating too much lately and I'm getting fat.
運動しないとデブるよ。
If you don't exercise, you'll get fat.