1To gain weight; to become fat or plump, usually as a result of overeating or lack of exercise.
最近忙しくて運動不足だから太ってきた。
I've been busy and haven't been exercising lately, so I've been gaining weight.
冬はつい食べ過ぎて太る人が多い。
Many people tend to gain weight in winter because they end up overeating.
医者にコレステロールを下げるために太らないようにと言われた。
The doctor told me not to gain weight in order to lower my cholesterol.
この犬は最近食べてばかりで、少し太った気がする。
This dog has just been eating lately, and I feel like it's gotten a bit fat.