Correct

背地里

/ bèidìli /
Strokes

Definition

behind sb's back

Example

As an Adverb

behind sb's back; furtively; privately; secretly; on the sly; in secret

1
Bèili
背地里
shuō
huàihuà
坏话

speak ill of him in his absence/behind his back

2
Bèili
背地里
chōuyān
抽烟

smoke on the sly