Translation

• the back door
• fig. under the counter (indirect way for influence or pressure)
• anus

Synonyms

• 方便之门

Examples

• 小偷从后门爬窗走进了房子里。
  The thief entered the house at the back door by the open window.
• 我们不想给人看见，所以就从后门走了进去。
  We came in through the back door lest someone should see us.