它是胖的用英语怎么说

"It is fat" 用英语可以说成 "It is overweight" 或 "It is plump"。

"Overweight" 来源于英语单词 "over" 和 "weight"，"over" 意为 "过多"，"weight" 意为 "重量"，所以 "overweight" 意为 "体重过重"。

"Plump" 来源于中古英语 "plumpen"，意为 "丰满"。

例句：

"He is overweight and needs to lose some weight." (他体重过重，需要减肥)
"She is plump, but she is still very attractive." (她丰满，但仍然很有魅力)