"On the sly" • Chinese-English Dictionary
| 偷偷 | tōu tōu | stealthily / secretly / covertly / furtively / on the sly |   |
| 暗中 | àn zhōng | in the dark / in secret / on the sly / surreptitiously | |
| 暗地里 | àn dì li | secretly / inwardly / on the sly | |
| 背地风 | bèi dì fēng | behind sb's back / privately / on the sly | |
