Having gained weight or become plump; the past form of the verb 'futoru' (to gain weight); commonly used as a descriptive expression.
最近ちょっと太ったようで、ズボンがきつくなった。
I seem to have gained a little weight recently; my pants have become tight.
冬の間に甘いものを食べすぎて太ってしまった。
I ate too many sweets over winter and ended up getting fat.
子猫がよく食べて太った。
The kitten ate well and got chubby.
彼は年をとってから少し太ったと言っている。
He says he has put on some weight since getting older.