掉下to drop off

• 油漆脱落了。

  The paint has peeled off.

• 泥灰脱落下来了

  the cement has peeled off

• 书的封面脱落了

  the cover has fallen off the book

• 邮票脱落了

  the stamp has fallen off

• 纽扣脱落了。

  The button has fallen off.

• 头发脱落了。

  One's hair has fallen out.

• 牙齿脱落了。

  One's teeth have fallen out.

参见：脱漏[tuōlòu]