掉下用英语怎么说

"Drop down" 或 "fall down" 都可以用来表示 "掉下" 的意思。

例句：

The leaves drop down from the tree. (叶子从树上掉下来。)
The vase fell down and broke into pieces. (花瓶掉下来并破成碎片。)

"Drop down" 来源于英语动词 "drop"，意思是 "掉落" 或 "落下"；"fall down" 来源于英语动词 "fall"，意思是 "倒下" 或 "跌倒"。