double chin 双下巴

beer belly 啤酒肚

spare tire 备胎，腰部的赘肉（口语）

muffin top 腰部的赘肉

middle-aged spread 大腹便便

Do you have a double chin?

你有双下巴嘛？

By the time he was 23 he had a enormous beer belly.

他23岁的时候啤酒肚就很大了

If only he took as much exercise as I did he wouldn't have that spare tire.

他要像我一样经常锻炼，腰上就不会有那么多的赘肉了。