名詞 backdoor:

1. an undocumented way to get access to a computer system or the data it contains
   同義詞：back door
2. an entrance at the rear of a building
   同義詞：back door, back entrance
3. a secret or underhand means of access (to a place or a position)
   同義詞：back door

back.door

adj.（形容詞）
Secret or surreptitious; clandestine:
偷偷摸摸的：秘密的或偷偷摸摸的；暗中的：
例句：
a backdoor romance.
秘密的浪漫

【引伸】
back.door.
adv.（副詞）