背地裡

behind sb's back

variant of 背[bei1]

to be burdened / to carry on the back or shoulder

the back of a body or object / to turn one's back / to hide something from / to learn by heart / to recite from memory / unlucky (slang) / hard of hearing

secretly / in private / behind someone's back

-ly / structural particle: used before a verb or adjective, linking it to preceding modifying adverbial adjunct

earth / ground / field / place / land / CL:片[pian4]

lining / interior / inside / internal / also written 裏|里[li3]