背後

Noun

 * 1)  on the back of someone
 * 2)  behind someone or something
 * 3)  behind
 * 1)  behind
 * 1)  behind

Adverb

 * 1) in secret; in private; surreptitiously; behind someone's back; privately; on the sly

Noun

 * 1) behind; back side
 * 2) a part that doesn't appear clearly
 * 1) a part that doesn't appear clearly