1 to be secretly in love with

1 dark

2 darkly

3 darkness

1 dusky

1 variant: 暗 àn

1 in the dark

2 in secret

3 on the sly

4 surreptitiously

1 of great reputation but shallow in knowledge (idiom)

1 The honest person does nothing underhand (idiom).

2 fig. Do what you want to do openly and without dissimulation.

1 lit. repair the plank road by day while secretly crossing the Wei River 渭河[Wèi Hé] at Chencang (idiom, refers to a stratagem used by Liu Bang 劉邦|刘邦[Liú Bāng] in 206 BC against Xiang Yu 項羽|项羽[Xiàng Yǔ] of Chu)

2 fig. to feign one thing while doing another

3 to cheat under cover of a diversion

1 open enquiries and secret search (idiom); to investigate openly and in secret

2 taking information from all sides

1 both covert and undercover (officers) keeping watch (idiom)